On Tuesday, September 2, 2025, Worcester Red Sox reporter Tommy Cassell revealed that the Boston Red Sox are calling up former San Francisco Giants pitching prospect Kyle Harrison.
The 24-year-old left-hander is slated to make his Red Sox debut on Wednesday, September 3, against the Cleveland Guardians at Fenway Park.
Harrison was dealt to Boston on June 15, 2025, as part of the blockbuster trade that sent Rafael Devers to San Francisco, with right-hander Jordan Hicks and two prospects also included in the package.
Since joining the Red Sox organization, Harrison has pitched exclusively for Triple-A Worcester, where he’s made 11 starts, posting a 4-2 record with a 3.65 ERA and 48 strikeouts across 49.1 innings.
Harrison Has Been Nursing An Injury
One potential hurdle remains for Kyle Harrison’s anticipated Red Sox debut.
Per Tommy Cassell, the left-hander has been dealing with a minor ankle issue and may undergo an MRI upon arriving in Boston. Should the scan uncover anything concerning, the club would likely shelve his start to avoid risking further injury.
That said, Harrison threw off a mound as recently as Tuesday, September 2, 2025, which indicates the ankle hasn’t been a significant setback. Combined with Boston’s decision to call him up, the signs point toward Harrison taking the ball as scheduled on Wednesday against Cleveland.
Red Sox Fans Are Really Hoping Harrison Pans OutÂ
Red Sox fans haven’t exactly been thrilled with the return San Francisco sent Boston in the blockbuster Rafael Devers trade.
Jordan Hicks, one of the main pieces in the deal, has struggled badly. In 20 outings, the hard-throwing righty owns a 6.38 ERA with just 14 strikeouts in 18 innings. Making matters worse, Boston is still on the hook for $25 million over the next two seasons, making any decision to cut ties far more complicated.
Another centerpiece, prospect James Tibbs III, has already been shipped out—sent to the Dodgers at the deadline in exchange for Dustin May. That move hasn’t worked out either. May has stumbled to a 1-4 record with a 5.68 ERA across five starts, giving up 32 hits in just 25 innings.
Tibbs, meanwhile, has shown flashes in Double-A with Los Angeles. He hasn’t been dominant, but he’s fared better than he did with Boston and remains the Dodgers’ No. 8 prospect at just 22 years old, leaving the door open for a promising future.
All of this feels even more painful for Red Sox fans when looking back at Devers. After a rocky start with the Giants, the slugger has caught fire and was just named National League Player of the Week, hitting .478 with three homers and 10 RBI. His resurgence only underscores the sting of Boston moving on from their franchise cornerstone.
That’s the backdrop for Kyle Harrison’s long-awaited debut. The Red Sox need him to blossom into the type of front-line arm who can shift the narrative of the trade.
Only time will tell if that happens.
Still, Harrison’s roots in the Bay Area mean many Giants fans are pulling for him to succeed—even if their cheers turn to boos whenever he faces San Francisco.
