Chase Plymell
Right-Handed Relief Pitcher
6´4´´
205 pounds
Age: 27
2025 South Side Sox Top 100 Ranking 91
2025 High Level Charlotte (AAA)
Age relative to high level -0.3 years
SSS rank among all right-handed relief pitchers in the system 14
Overall 2025 stats (AA/AAA) 1-1 ⚾️ 2 SV ⚾️ 35 games (2 starts, 5 finishes) ⚾️ 56 1/3 IP ⚾️ 3.20 ERA ⚾️ 1.296 WHIP ⚾️ 35 K ⚾️ 19 BB ⚾️ 1.1 WAR

Chase Plymell grew up in central Missouri, and began his journey to MLB playing for State Fair Community College in his hometown before transferring to University of Central Missouri for his last two years of college ball. Because the pandemic cut his 2020 season short, Plymell was able to return to UCM in 2021 and was phenomenal, with a 1.88 ERA over 31 1/3 innings.

Chase went undrafted in 2021, but began drawing the attention of MLB scouts with his performance in 14 games in the MLB Development League. The White Sox jumped on the opportunity to sign Plymell that September, giving him his first pro experience (ACL White Sox, two hitless innings).

Plymell had a relatively decent start in his full season as a pro, with the Low-A Kannapolis Cannon Ballers; though he didn’t have a dominating campaign he still had many strong outings and flashes of talent. Over 34 1⁄3 innings with the Ballers, Chase posted a 4.19 ERA and a 1.340 WHIP, though his 2.71 FIP tells a bit of a different story when you remove the factors that he can’t control as a pitcher. Plymell had a 29.7% K% compared to a 4.8% BB%, walked only seven batters, and he was able to force a ground ball nearly 45% of the time — proving his skills as legitimate.

Plymell spent the second half of the 2022 season with the High-A Winston-Salem Dash, and his performance was not nearly as efficient. Plymell pitched for 27 2⁄3 innings with the Dash and ballooned his ERA to 7.81, with a K% dropped to 20.7%. His BB% was two times his walk rate in Low-A ball (12.9%) for 5.86 walks per nine innings (18 total). Chase finished with a 5.81 ERA and a 1.677 WHIP for the 2022 season, with a lot of work ahead of him in the offseason.

Plymell entered his second full year (2023) with the High-A Dash and made a lot of progress refining his performance at this level. In 26 games and 49 2⁄3 innings Plymell logged a 3.26 ERA, and while walks were still a bit of a challenge (12.9% BB%) he was at least able to raise his K% to 24.3%.

Plymell advanced to the Double-A Birmingham Barons to close out the season, but once again the midseason shift didn’t treat him well. Though it was a much smaller sample size, increased free passes continued to be detrimental to his overall stats and production. Plymell’s 8.50 ERA with the Barons was not a pretty way to end the season, and his WHIP inflated immensely (2.222). Batters posted a .337 batting average against him and were getting on base at a high rate from walks as well (6 BB/9).

The good news is that the volatility to Plymell’s performance leveled out in 2024 after working through the offseason. This past season, he split his time almost evenly between Birmingham and the Triple-A Charlotte Knights. For the first half of the season, he wasn’t striking out guys at as high of a rate as he was the last few years, but his BB% was significantly lowered (5.1%) and his 1.122 WHIP and 3.99 FIP were back into a more inspiring range.

Plymell put up a 3.42 ERA across the entire season, and actually had a stronger ERA (3.08) and opponent BA (.213) after moving up to Triple-A. But once again, control became an issue: A 5.92 K/9 laid up against a 4.03 BB/9 is tough to ignore.

The righty rebounded well in 2025, enough to earn some Greyhound bonus miles in April, when he moved between Charlotte and Birmingham four times before settling in at Triple-A for the remainder of the season. In the inhospitable climes of Charlotte, Plymell excelled with a 3.44 ERA while roaming all over the pen from opener to middle relief to closer.

Plymell’s top pitches are his fastball and slider, making up about 85% of his game usage. There’s about an 11 mph difference between the two pitches, as his fastball velocity averages out in the low-90s.

While nothing jumps out about Plymell, who will turn 28 during the 2026 season, his admirable turn in Charlotte last summer earned him some points with White Sox brass. He reminds a bit of Declan Cronin, and it would be no shock to see Plymell get a similar cup of coffee in the majors, as Cronin did in 2023. Consider Plymell on the cusp of the MLB bullpen, with an outside chance of breaking camp with Chicago.

Full 2026 South Side Sox Top 100 White Sox Prospects Storystream

2026 Top 100 Prospects no longer in the system
15. Peyton Pallette, RHRP (lost to Cleveland in the Rule 5 draft)
43. Ronny Hernandez, C (traded to Boston on Nov. 18, 2025)
51. Drew Dalquist, RHRP (declared free agency)
66. Andre Lipcius, 1B (declared free agency)
84. Caleb Freeman, RHRP (declared free agency)
90. DJ Gladney, RF (declared free agency)
98. Luis Pineda, C (declared free agency)

Estimated prospect ratings for players added this offseason but too late for our Top 100
23. Alexander Alberto, RHRP (Rule 5 pick from Tampa Bay)
40. Tristan Peters, OF (trade from Tampa Bay)
44. Tim Elko, 1B (re-signed as MiLB free agent)
45. Jackson Kelley, RHRP (MiLB Rule 5 pick from Texas)
87. Tanner Murray, INF (trade from Tampa Bay)