| Date | News | Comment |
| Jun 27 2025 | Harrison allowed four runs on eight hits and one walk while striking out four over four innings for Triple-A Worcester on Thursday. | ROTOWIRE RECOMMENDS: Harrison was nicked for a pair of runs in each of the first and third innings, including a home run, in his debut for the organization. He was part of the package Boston acquired from San Francisco in the Rafael Devers trade. The right-hander threw mostly fastballs, per Baseball Savant, but didn't begin incorporating any of the new pitches (sinker, cutter) the Red Sox want him to add to his arsenal. The four-seamer will be the main event, while the organization works to introduce the new offerings. He also threw slurves, sliders and changeups Thursday. |
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| Jun 26 2025 | Harrison is working on revamping his repertoire at Triple-A Worcester before joining their rotation next week, Tommy Cassell of the Worcester Telegram & Gazette reports. | ROTOWIRE RECOMMENDS: Acquired from the Giants in the Rafael Devers trade, Harrison worked on some new pitches -- including a cutter and sinker -- during a live batting practice session this week. The lefty threw a four-seamer, slurve and changeup during his time in San Francisco, with Red Sox director of pitching Justin Williard calling the four-seamer a "unique fastball that's going to be his bread and butter." The Red Sox want Harrison to find some consistent secondary offerings to pair with the four-seamer, and senior director of player development Brian Abraham said "the returns have been really good so far" with the southpaw. Harrison figures to make at least a couple starts with Worcester as he works on his new offerings, but the plan seems to be to have him as part of Boston's rotation sooner rather than later. |
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| Jun 15 2025 | Harrison was optioned to Triple-A Worcester after being traded to the Red Sox on Sunday. | ROTOWIRE RECOMMENDS: Harrison will report to Triple-A Worcester to begin his tenure with his new team. The left-hander owns a career 4.48 ERA and 1.30 WHIP with 178 strikeouts over 182.2 innings in 39 appearances, including 35 starts, with the Giants. He figures to project as a long-term asset as a starting pitcher for the Red Sox, and his time in Triple-A will likely be brief. |
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| Jun 11 2025 | Harrison did not factor into the decision Tuesday, allowing three runs on four hits and two walks over five innings against the Rockies. He struck out six. | ROTOWIRE RECOMMENDS: The left-hander was burned by the long ball Tuesday, giving up home runs to Ryan McMahon and Kyle Farmer. Harrison has made four starts since joining the rotation May 24, with mixed results. The 23-year-old owns a 4.91 ERA and 1.36 WHIP over 18.1 innings as a starter, compared to a 3.38 ERA and 0.94 WHIP in 5.1 innings out of the bullpen. |
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| Jun 9 2025 | Harrison (elbow) is listed as the Giants' probable starter for Tuesday's game against the Rockies in Colorado. | ROTOWIRE RECOMMENDS: Harrison's previous start last Wednesday against the Padres was cut short after he was struck on the left elbow by a comebacker midway through the fifth inning, but he escaped the incident with nothing more than a bruise. The southpaw was able to complete his between-starts bullpen session over the weekend and looks set to pitch Tuesday with no restrictions. However, Harrison -- who owns a 4.73 ERA, 1.43 WHIP and 12:4 K:BB in 13.1 innings over his previous three starts -- won't make for a comfortable streaming option in a road start at hitter-friendly Coors Field. |
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| Jun 4 2025 | Harrison was diagnosed with a left elbow contusion after getting hit by a comebacker during Wednesday's game against San Diego, Alex Pavlovic of NBC Sports Bay Area reports. | ROTOWIRE RECOMMENDS: Harrison took a grounder off his elbow during the fifth inning of Wednesday's contest and was immediately pulled from the game. However, it appears he escaped from the incident with only a bruise. A scheduled day off Monday will give Harrison an extra day to rest before his next scheduled start, but the Giants will wait a few days to see how he recovers from his bruise before they pencil him in for another outing. The southpaw allowed five runs on nine hits and one walk while striking out three batters in his 4.2 frames Wednesday and finished with a no-decision. |
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| May 30 2025 | Harrison (1-1) got the win and turned in a solid performance throwing five innings of shutout ball in Friday's 2-0 win over the Marlins. He allowed one hit, walked three and struck out five. | ROTOWIRE RECOMMENDS: In just his second start of the season since transitioning from the bullpen, Harrison had a longer leash Friday and took advantage of it, working five shutout innings in just 80 pitches. In his two starts (9.0 innings), he allowed just two runs with nine strikeouts. With Justin Verlander (pectoral) on the way back from the injured list, the 23-year-old Harrison might not get the chance to start again when his turn comes back up, but he made a strong case to be the team's choice to make a spot start should injuries strike the Giants rotation again. |
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| May 29 2025 | Harrison is slated to start Friday's game against the Marlins in Miami. | ROTOWIRE RECOMMENDS: After getting called up from Triple-A Sacramento on May 4, Harrison initially worked out of the bullpen, but he moved into the rotation last week following Justin Verlander's (pectoral) placement on the injured list. Harrison took a loss to the Nationals in his first start with the Giants last Saturday, giving up two runs in four innings while striking out four batters. The lefty should have a longer leash in his second start after tossing just 57 pitches against Washington, but he may not be guaranteed any turns through the rotation beyond Friday. Verlander threw a 40-pitch bullpen session Tuesday and could be ready to return from the IL as soon as next week. |
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| May 24 2025 | Harrison (0-1) took the loss Saturday as the Giants fell 3-0 to the Nationals, giving up two runs on five hits over four innings. He struck out four without walking a batter. | ROTOWIRE RECOMMENDS: The 23-year-old southpaw pitched well in his first big-league start of the season, tossing 43 of 57 pitches for strikes, but Harrison served up a two-run homer to James Wood in the first inning and the Giants' offense never woke up. With Justin Verlander (pectoral) on the shelf, Harrison will get at least one more turn through the rotation, and he should get stretched out enough to potentially qualify for a win next weekend in Miami. Through 9.1 MLB innings in 2025, Harrison has a 3.86 ERA, 1.07 WHIP and 11:3 K:BB. |
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| May 23 2025 | Harrison will start Saturday's game against the Nationals, Alex Pavlovic of NBC Sports Bay Area reports. | ROTOWIRE RECOMMENDS: He's absorbing the rotation spot vacated by the injured Justin Verlander (pectoral). Harrison has made four relief appearances since being recalled earlier this month, allowing two runs with a 7:3 K:BB over 5.1 frames. The lefty had been starting at Triple-A Sacramento but hasn't pitched more than two innings in over three weeks, so he's likely to have a limited workload versus the Nationals. |
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| May 10 2025 | Harrison tossed two scoreless innings in Friday's 3-1 loss to the Twins, allowing three walks (one intentional) while striking out three. | ROTOWIRE RECOMMENDS: Harrison made his second appearance since being recalled from Triple-A Sacramento on Monday and has yet to allow a run over three innings of relief. The 23-year-old southpaw is expected to remain in the bullpen for now, though he could eventually make a case to join the starting rotation after missing out on an Opening Day spot. Harrison recorded a 3.46 ERA, 1.31 WHIP and a 38:8 K:BB across 26 innings in six starts with Sacramento. |
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| May 5 2025 | The Giants plan to use Harrison in their bullpen after officially recalling him from Triple-A Sacramento on Monday, Alex Pavlovic of NBC Sports Bay Area reports. | ROTOWIRE RECOMMENDS: Harrison pitched exclusively as a starter during his time in the big leagues the past two seasons and has continued to start with Sacramento after failing to win a spot in the Giants' Opening Day rotation. Over his six outings at Triple-A, Harrison turned in a 3.46 ERA and 38:8 K:BB in 26 innings, and those strong results could give him a case for eventually supplanting Landen Roupp as the Giants' No. 5 starter. For the time being, however, Harrison will work out of the bullpen, where the Giants believe that his improved velocity in his recent appearances with Sacramento will allow him to continue piling up strikeouts as an MLB reliever. Harrison will likely stick around with the Giants through the end of their road trip this weekend before the organization decides whether to move him into a starting role, keep him on hand as a reliever or send him back to Triple-A to make regular turns through the rotation. |
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| May 4 2025 | Harrison was recalled from Triple-A Sacramento on Sunday, Justice delos Santos of The San Jose Mercury News reports. | ROTOWIRE RECOMMENDS: Harrison will join the major-league roster for the first time in 2025 after posting a 3.46 ERA and 1.31 WHIP with 38 strikeouts over 26 innings in six starts with Triple-A Sacramento so far this year. The right-hander could replace Landen Roupp in the Giants' starting rotation or operate as a bullpen arm with the big club moving forward. In a corresponding move, reliever Lou Trivino was designated for assignment Sunday. |
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