Thomas Harrington’s 2025 season got off to an up-and-down start. After making his debut with the Pittsburgh Pirates in the second series of the year, Harrington struggled to adjust to big league hitters. He was sent back down to AAA Indianapolis a week after his first MLB start. Then, the 23-year-old right-hander faced significant challenges in his return to the minor leagues, posting a 6.87 ERA through April and May.
However, June has been a different story. Harrington has turned things around in impressive fashion, delivering three consecutive quality starts and showcasing the pitching potential that made him MLB Pipeline’s No. 80 overall prospect.
His best performance yet came last Saturday, when he dominated St. Paul (Twins) with a career-high 10 strikeouts over six strong innings, allowing just two runs in a winning effort. Harrington’s command and confidence have clearly improved, as opposing hitters have managed only a .159 batting average against him this month.
Make it four double-digit strikeout performances in the pro career of Thomas Harrington ☠️
— MLB Pipeline (@MLBPipeline) June 15, 2025
The @Pirates' third-ranked prospect racks up a season-best 10 K's, giving him three straight quality starts for the Triple-A @indyindians: pic.twitter.com/XcNvwe4C6L
Harrington was called up to the Pirates on April 1st, then made his debut in a start against the Tampa Bay Rays later that night. He struggled from the onset of the game, and gave up three earned runs in the first inning. Harrington settled in a bit until he gave up a three-run homer to Brandon Lowe in the fourth inning. The rookie went on to finish the inning, but ultimately ended up with a line of six earned runs in four innings pitched. He walked four and struck out two.
His next appearance was in relief, six days later against the St. Louis Cardinals. It was a bit more promising - he struck out five in four innings pitched while recording his first career save. But the righty also gave up two home runs and three earned runs. Harrington was sent down to Indianapolis two days later.
After his early-season struggles, Harrington’s rebound in AAA has been a promising development. His recent outings highlight his ability to adjust and refine his approach, a key factor in his rise through the minors.
During Saturday's start, Harrington's off-speed arsenal was particularly effective. Eight of his ten strikeouts came from off-speed pitches: six from his sweeper and two from his splitter.
With continued consistency, Harrington could soon earn another opportunity at the major league level. For now, his resurgence in AAA serves as a reminder of his long-term potential as a reliable starting pitcher.
Results & Current Record: 6-1 vs. St. Paul, 40-28 this season
Top Performers:
Notable: Suwinski continued his scorching hot month of June. This month, he has a .333 batting average, a .404 on-base-percentage, with three home runs and 12 runs batted in.
Results & Current Record: 3-3 vs. Erie, 28-35 this season
Top Performers:
Notable: The Curve used their bullpen for all nine innings of Sunday night's 7-1 win over Erie. Townsend started the game and pitched four innings as the "bulk opener".
Results & Current Record: 5-1 vs Rome, 42-20 this season
Top Performers:
Notable: The Grasshoppers have the second most wins in High-A, trailing only the Brooklyn Cyclones (43-20) and the West Michigan Whitecaps (43-20). However, they have played one fewer game than both teams.
Results & Current Record: 2-4 vs Jupiter, 29-34 this season
Top Performers:
Notable: On Sunday, the Marauders won 2-1 on a walk-off, bases-loaded balk by Jupiter relief pitcher Luis Ramirez.
Konnor Griffin (GRN) – What more is there to say about the 19-year-old who continues to wreak havoc on minor league pitchers? He already looks like he may be one of the best hitters at the High-A level - and he's one of the youngest in the league. Griffin smacked home runs in consecutive games over the weekend, and already has six stolen bases and ten runs scored in six games. It would not be shocking to see Griffin in Altoona by the end of the season. It is a bit more cloudy as to when Griffin will debut at PNC Park, but he may force the Pirates organization hand next season if he keeps this up.
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