Red Sox’ Robert Kwiatkowski earns win in Triple-A debut

After his side jumped out to a 4-2 lead, Kwiatkowski worked his way around a leadoff walk in an otherwise clean bottom of the fourth. He gave up a hard-hit double to Jace Jung with one out in the fifth but escaped the frame unscathed by punching out Keston Hiura and getting Justice Bigbie to ground out to the rehabbing Vaughn Grissom at second base.

All told, Kwiatkowski allowed just the one hit and one walk across 2 2/3 scoreless frames of relief as Worcester went on to defeat Toledo by a final score of 8-5. The 6-foot-1, 190-pound hurler struck out three of the 10 batters he faced and induced six swings-and-misses on the 42 pitches (27 strikes) he threw. He averaged 93.4 mph and topped out at 94.3 mph with his four-seam fastball while mixing in a high-80s changeup, a low-80s slider and curveball, and a high-80s sinker, per Baseball Savant.

Kwiatkowski, who turns 27 in June, opened the 2024 season with Portland after spending nearly two months there last year. In his second stint with the Sea Dogs, he posted a 2.08 ERA and 3.67 FIP with eight strikeouts to two walks over five relief outings (8 2/3 innings) in which he held opposing hitters to a .175 batting average against.

In making his WooSox debut on Sunday, Kwiatkowski joined fellow righty Brian Van Belle as the only other undrafted free agent signed by the Red Sox in 2020 to make it as far as Triple-A. Of the 16 undrafted free agents Boston signed in the wake of the COVID-shortened draft that summer, Kwiatkowski, Van Belle, and Juan Montero (a catcher with Low-A Salem) are all who still remain in the organization.

A Georgia native, Kwiatkowski inked his first professional contract with the Red Sox after spending the final two years of his collegiate career at Marshall. As was the case for all undrafted free agents in 2020, Kwiatkowski received a modest $20,000 signing bonus. He made his pro debut in May 2021 and has since forged a 4.23 ERA (4.37 FIP) with 125 strikeouts to 59 walks over 101 appearances (four starts, 174 1/3 innings) across four minor-league levels.