Who doesn’t love high-ceiling left-handed starters?

Just a quick recap of the mid-season list: We’ll look at the player’s stats, my observations, and finally other publications (Prospects Live, MLB Pipeline, Baseball America)’ scouting reports.
In this article, we’ll take a look at Adam Macko, the prospect who came back along with Erik Swanson in the Teoscar Hernandez trade with the Seattle Mariners. 
<h2>Getting to know Adam Macko…</h2>
Position: Starting Pitcher
Throws: Left
Born: December 30, 2000
Acquired: Trade with the Seattle Mariners
Current Team: High-A Vancouver
Previous Ranking: 14
The results haven’t been great for Macko in 2023, but damn the ceiling is high. The 22-year-old lefty was acquired in the Teoscar Hernández trade back in November 2022 and spent his entire season with the High-A Vancouver Canadians.
This season, he has a 5.33 ERA and a 4.23 FIP in 76 innings pitched, along with a 27 K% and a 10.4 BB%. In the last three seasons, Macko had only thrown a combined 71.2 innings, so the fact he’s remained healthy is a great sign.
His strikeout rate in 2021 and 2022 were 36.1% and 35.9% respectively, but while that has dropped to a still solid 27%, his walk rate of 10.4% is the lowest of his career.
Results aside, it’s Macko’s stuff that makes him so intriguing. He sits around 91-95 mph, but has touched as high as 97 mph with the heater, which is what you want in a left-handed pitcher. Moreover, he has a fantastic looping curveball that generates a ton of swing and miss. To round out his pitch mix, he has a solid slider and a changeup that’s still under development, but the shape on it is nice.
The biggest thing for Macko is to remain healthy, but also drop the walk rate even further. So far in 2023, he’s done just that and he remains a very intriguing starter to watch over the next several seasons.
<h2>Next up&#8230;</h2>
In the next article, we have a prospect who has dropped out of the top 10 but has the stuff to be an important member of the bullpen.
<hr />
<h2>In case you missed it…</h2>
<ul class="mb-5 list-disc pl-8">
<li class=""><a class="text-accent" href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-50-garrett-spain" target="_blank" rel="noopener noreferrer">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 50: Garrett Spain</a></li>
<li class=""><a class="text-accent" href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-49-connor-cooke" target="_blank" rel="noopener noreferrer">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 49: Connor Cooke</a></li>
<li class=""><a class="text-accent" href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-48-michael-dominguez" target="_blank" rel="noopener noreferrer">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 48: Michael Dominguez</a></li>
<li class=""><a class="text-accent" href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-47-alejandro-melean" target="_blank" rel="noopener noreferrer">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 47: Alejandro Melean</a></li>
<li class=""><a class="text-accent" href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-46-trenton-wallace" target="_blank" rel="noopener noreferrer">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 46: Trenton Wallace</a></li>
<li class=""><a class="text-accent" href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-45-brennan-orf" target="_blank" rel="noopener noreferrer">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 45: Brennan Orf</a></li>
<li class=""><a class="text-accent" href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-44-robert-robertis" target="_blank" rel="noopener noreferrer">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 44: Robert Robertis</a></li>
<li class=""><a class="text-accent" href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-43-sam-shaw" target="_blank" rel="noopener noreferrer">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 43: Sam Shaw</a></li>
<li class=""><a class="text-accent" href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-42-rafael-lantigua" target="_blank" rel="noopener noreferrer">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 42: Rafael Lantigua</a></li>
<li class=""><a class="text-accent" href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-41-yhoangel-aponte" target="_blank" rel="noopener noreferrer">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 41: Yhoangel Aponte</a></li>
<li class=""><a class="text-accent" href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-40-nick-goodwin" target="_blank" rel="noopener noreferrer">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 40: Nick Goodwin</a></li>
<li class=""><a class="text-accent" href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-39-irv-carter" target="_blank" rel="noopener noreferrer">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 39: Irv Carter</a></li>
<li class=""><a class="text-accent" href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-38-jimmy-robbins" target="_blank" rel="noopener noreferrer">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 38: Jimmy Robbins</a></li>
<li class=""><a class="text-accent" href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-37-otto-lopez" target="_blank" rel="noopener noreferrer">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 37: Otto López</a></li>
<li class=""><a class="text-accent" href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-36-peyton-williams" target="_blank" rel="noopener noreferrer">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 36: Peyton Williams</a></li>
<li class=""><a class="text-accent" href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-35-trent-palmer" target="_blank" rel="noopener noreferrer">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 35: Trent Palmer</a></li>
<li class=""><a class="text-accent" href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-34-c-j-van-eyk" target="_blank" rel="noopener noreferrer">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 34: C.J. Van Eyk</a></li>
<li><a href="https://bluejaysnation.com/news/mariners-overtake-blue-jays-in-standings-following-win-against-astros">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 33: Dasan Brown</a></li>
<li><a href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-32-tanner-morris">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 32: Tanner Morris</a></li>
<li><a href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-31-connor-ohalloran">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 31: Connor O’Halloran</a></li>
<li><a href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-30-kendry-rojas">Blue Jays Nation&#8217;s Mid-Season Prospect Countdown &#8211; No. 30: Kendry Rojas</a></li>
<li><a href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-29-zach-britton">Blue Jays Nation&#8217;s Mid-Season Prospect Countdown &#8211; No. 29: Zach Britton</a></li>
<li><a href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-28-adrian-pinto">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 28: Adrian Pinto</a></li>
<li><a href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-27-rainer-nunez">Blue Jays Nation&#8217;s Mid-Season Prospect Countdown &#8211; No. 27: Rainer Nuñez</a></li>
<li><a href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-26-hagen-danner">Blue Jays Nation&#8217;s Mid-Season Prospect Countdown &#8211; No. 26: Hagen Danner</a></li>
<li><a href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-25-hayden-juenger">Blue Jays Nation&#8217;s Mid-Season Prospect Countdown &#8211; No. 25: Hayden Juenger</a></li>
<li><a href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-24-manuel-beltre">Blue Jays Nation&#8217;s Mid-Season Prospect Countdown &#8211; No. 24: Manuel Beltre</a></li>
<li><a href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-23-chad-dallas">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 23: Chad Dallas</a></li>
<li><a href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-22-josh-kasevich">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 22: Josh Kasevich</a></li>
</ul>
<hr />
As always, you can follow me on Twitter, Instagram, and Threads @Brennan_L_D.
<hr />
<h2 class="mb-5 text-2xl font-bold" style="text-align: center;"><a class="text-accent" href="https://gml-grp.com/C.ashx?btag=a_24038b_2065c_&amp;affid=7966&amp;siteid=24038&amp;adid=2065&amp;c=" target="_blank" rel="noopener noreferrer nofollow">ARTICLE PRESENTED BY BETANO</a></h2>
<img loading="lazy" decoding="async" class="aligncenter size-full wp-image-61491" src="https://publish.bluejaysnation.com/wp-content/uploads/sites/8/2023/04/Betano_ON_Base_727x404-1.png" alt="" width="727" height="404" srcset="https://publish.bluejaysnation.com/wp-content/uploads/sites/8/2023/04/Betano_ON_Base_727x404-1.png 727w, https://publish.bluejaysnation.com/wp-content/uploads/sites/8/2023/04/Betano_ON_Base_727x404-1-300x167.png 300w" sizes="auto, (max-width: 727px) 100vw, 727px" />

Who doesn’t love high-ceiling left-handed starters?



Just a quick recap of the mid-season list: We’ll look at the player’s stats, my observations, and finally other publications (Prospects Live, MLB Pipeline, Baseball America)’ scouting reports.

In this article, we’ll take a look at Adam Macko, the prospect who came back along with Erik Swanson in the Teoscar Hernandez trade with the Seattle Mariners. 
<h2>Getting to know Adam Macko…</h2>
Position: Starting Pitcher

Throws: Left

Born: December 30, 2000

Acquired: Trade with the Seattle Mariners

Current Team: High-A Vancouver

Previous Ranking: 14

The results haven’t been great for Macko in 2023, but damn the ceiling is high. The 22-year-old lefty was acquired in the Teoscar Hernández trade back in November 2022 and spent his entire season with the High-A Vancouver Canadians.

This season, he has a 5.33 ERA and a 4.23 FIP in 76 innings pitched, along with a 27 K% and a 10.4 BB%. In the last three seasons, Macko had only thrown a combined 71.2 innings, so the fact he’s remained healthy is a great sign.

His strikeout rate in 2021 and 2022 were 36.1% and 35.9% respectively, but while that has dropped to a still solid 27%, his walk rate of 10.4% is the lowest of his career.

Results aside, it’s Macko’s stuff that makes him so intriguing. He sits around 91-95 mph, but has touched as high as 97 mph with the heater, which is what you want in a left-handed pitcher. Moreover, he has a fantastic looping curveball that generates a ton of swing and miss. To round out his pitch mix, he has a solid slider and a changeup that’s still under development, but the shape on it is nice.

The biggest thing for Macko is to remain healthy, but also drop the walk rate even further. So far in 2023, he’s done just that and he remains a very intriguing starter to watch over the next several seasons.
<h2>Next up...</h2>
In the next article, we have a prospect who has dropped out of the top 10 but has the stuff to be an important member of the bullpen.

<hr />

<h2>In case you missed it…</h2>
<ul class="mb-5 list-disc pl-8">
 	<li class=""><a class="text-accent" href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-50-garrett-spain" target="_blank" rel="noopener noreferrer">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 50: Garrett Spain</a></li>
 	<li class=""><a class="text-accent" href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-49-connor-cooke" target="_blank" rel="noopener noreferrer">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 49: Connor Cooke</a></li>
 	<li class=""><a class="text-accent" href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-48-michael-dominguez" target="_blank" rel="noopener noreferrer">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 48: Michael Dominguez</a></li>
 	<li class=""><a class="text-accent" href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-47-alejandro-melean" target="_blank" rel="noopener noreferrer">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 47: Alejandro Melean</a></li>
 	<li class=""><a class="text-accent" href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-46-trenton-wallace" target="_blank" rel="noopener noreferrer">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 46: Trenton Wallace</a></li>
 	<li class=""><a class="text-accent" href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-45-brennan-orf" target="_blank" rel="noopener noreferrer">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 45: Brennan Orf</a></li>
 	<li class=""><a class="text-accent" href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-44-robert-robertis" target="_blank" rel="noopener noreferrer">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 44: Robert Robertis</a></li>
 	<li class=""><a class="text-accent" href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-43-sam-shaw" target="_blank" rel="noopener noreferrer">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 43: Sam Shaw</a></li>
 	<li class=""><a class="text-accent" href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-42-rafael-lantigua" target="_blank" rel="noopener noreferrer">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 42: Rafael Lantigua</a></li>
 	<li class=""><a class="text-accent" href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-41-yhoangel-aponte" target="_blank" rel="noopener noreferrer">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 41: Yhoangel Aponte</a></li>
 	<li class=""><a class="text-accent" href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-40-nick-goodwin" target="_blank" rel="noopener noreferrer">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 40: Nick Goodwin</a></li>
 	<li class=""><a class="text-accent" href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-39-irv-carter" target="_blank" rel="noopener noreferrer">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 39: Irv Carter</a></li>
 	<li class=""><a class="text-accent" href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-38-jimmy-robbins" target="_blank" rel="noopener noreferrer">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 38: Jimmy Robbins</a></li>
 	<li class=""><a class="text-accent" href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-37-otto-lopez" target="_blank" rel="noopener noreferrer">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 37: Otto López</a></li>
 	<li class=""><a class="text-accent" href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-36-peyton-williams" target="_blank" rel="noopener noreferrer">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 36: Peyton Williams</a></li>
 	<li class=""><a class="text-accent" href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-35-trent-palmer" target="_blank" rel="noopener noreferrer">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 35: Trent Palmer</a></li>
 	<li class=""><a class="text-accent" href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-34-c-j-van-eyk" target="_blank" rel="noopener noreferrer">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 34: C.J. Van Eyk</a></li>
 	<li><a href="https://bluejaysnation.com/news/mariners-overtake-blue-jays-in-standings-following-win-against-astros">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 33: Dasan Brown</a></li>
 	<li><a href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-32-tanner-morris">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 32: Tanner Morris</a></li>
 	<li><a href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-31-connor-ohalloran">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 31: Connor O’Halloran</a></li>
 	<li><a href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-30-kendry-rojas">Blue Jays Nation's Mid-Season Prospect Countdown - No. 30: Kendry Rojas</a></li>
 	<li><a href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-29-zach-britton">Blue Jays Nation's Mid-Season Prospect Countdown - No. 29: Zach Britton</a></li>
 	<li><a href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-28-adrian-pinto">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 28: Adrian Pinto</a></li>
 	<li><a href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-27-rainer-nunez">Blue Jays Nation's Mid-Season Prospect Countdown - No. 27: Rainer Nuñez</a></li>
 	<li><a href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-26-hagen-danner">Blue Jays Nation's Mid-Season Prospect Countdown - No. 26: Hagen Danner</a></li>
 	<li><a href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-25-hayden-juenger">Blue Jays Nation's Mid-Season Prospect Countdown - No. 25: Hayden Juenger</a></li>
 	<li><a href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-24-manuel-beltre">Blue Jays Nation's Mid-Season Prospect Countdown - No. 24: Manuel Beltre</a></li>
 	<li><a href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-23-chad-dallas">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 23: Chad Dallas</a></li>
 	<li><a href="https://bluejaysnation.com/news/blue-jays-nations-mid-season-prospect-countdown-no-22-josh-kasevich">Blue Jays Nation’s Mid-Season Prospect Countdown – No. 22: Josh Kasevich</a></li>
</ul>

<hr />

As always, you can follow me on Twitter, Instagram, and Threads @Brennan_L_D.

<hr />

<h2 class="mb-5 text-2xl font-bold" style="text-align: center;"><a class="text-accent" href="https://gml-grp.com/C.ashx?btag=a_24038b_2065c_&amp;affid=7966&amp;siteid=24038&amp;adid=2065&amp;c=" target="_blank" rel="noopener noreferrer nofollow">ARTICLE PRESENTED BY BETANO</a></h2>
<img class="aligncenter size-full wp-image-61491" src="https://publish.bluejaysnation.com/wp-content/uploads/sites/8/2023/04/Betano_ON_Base_727x404-1.png" alt="" width="727" height="404" />

Blue Jays Nation’s Mid-Season Prospect Countdown – No. 21: Adam Macko

Instant Reaction: Blue Jays blowout Mariners in Game 3 of ALCS to cut series lead in half

Blue Jays: Addison Barger’s regular season hot streak began in Seattle

Blue Jays: 2025 Arizona Fall League Game 4 recap

Blue Jays GDB – ALCS Game 3: Toronto looks to avoid going down 3-0 in series

Seattle Mariners starting pitcher George Kirby (68) reacts after striking out the side against the Detroit Tigers in the fifth inning during game five of the ALDS round for the 2025 MLB playoffs at T-Mobile Park.

Recent articles from Ryley Delaney

Breaking News