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Kyle Harrison

#38 SP / Boston Red Sox / EXP: 3YRS Height: 6-2 Weight: 209 lb Age: 24 College: None Bats/Throws R/L

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11%
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7%
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  • Harrison did not factor into the decision Friday against the Tigers, allowing three runs on seven hits and three walks over three innings. He struck out six. The Red Sox southpaw struggled out the gate, as he escaped a scoreless first inning in which he conceded two walks and a hit. The Detroit lineup finally broke through against Harrison in the fourth, when the first five batters reached, plating three runs. Given that the 24-year-old tossed 65 pitches in this appearance, he likely wraps his regular season with a 4.04 ERA, 1.37 WHIP and 38:14 K:BB across 35.2 total frames with Boston and San Francisco.

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  • Harrison is slated to start Friday's game against the Tigers in Boston. Harrison stepped in as Boston's fifth starter last weekend at Tampa Bay and aced the test, striking out five while allowing one earned run on four hits and two walks across six innings in a no-decision. The southpaw will be rewarded with another turn through the rotation Friday, and another strong showing could help his case for earning a spot on Boston's postseason roster, should the Red Sox clinch a playoff spot.

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  • Harrison didn't factor into the decision Saturday against the Rays, allowing one run on four hits and two walks in six innings. He struck out five. Saturday was Harrison's first start with the Red Sox since being acquired from San Francisco as part of the Rafael Devers trade, and it couldn't have gone much better. It was the southpaw's first quality start of the season, and he also generated 11 swinging strikes. Harrison has been effective when healthy in 2025, posting a 3.58 ERA, 1.19 WHIP and 32:11 K:BB over 32.2 innings, and Boston figures to give him one more look in its rotation during the regular season next weekend against Detroit.

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  • Red Sox manager Alex Cora said that Harrison will start Saturday's game against the Rays in Tampa, Jen McCaffrey of The Athletic reports. Harrison will move into the rotation as a replacement for rookie lefty Payton Tolle, whom Cora said would be used in the bullpen for the remainder of the season. After getting called up from Triple-A Worcester last week, Harrison made his Red Sox debut out of the bullpen Sept. 10 in Sacramento, striking out two over three scoreless innings. Though he had been serving in a starting role for Worcester, Harrison hadn't covered five frames in an outing since Aug. 19, so the Red Sox may not be counting on the lefty working deep into his start Saturday.

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  • Red Sox's Kyle Harrison: Makes Boston debut
    By RotoWire

    Harrison allowed three hits, hit a batter and struck out two over three scoreless relief innings in Wednesday's 5-4 loss to the Athletics. Harrison pitched the final three innings in a piggyback outing that was started by Payton Tolle (two innings). Harrison isn't fully built up after a series of stops and starts over the last couple of weeks that included an ankle injury. He could be a factor later in September, as he unlikely has the same innings limits of rookies Tolle and Connelly Early.

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Stats

YearTeamAPPGSINNWLSKBBIHAERAWHIP
2025 SF-BOS 11 6 35.7 1 1 0 38 14 35 4.03 1.37
2024 SF 24 24 124.3 7 7 0 118 42 125 4.56 1.34

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Next Matchup

SituationRecordERAINNERK

Last 7 Games

DATEOppWLSINNHAERABBIKWHIP
9/26
vs 
- - - 3.0 7 4.20 3 6 3.33
9/20
- - - 6.0 4 3.67 2 5 1.00
9/10
- - - 3.0 3 4.29 0 2 1.00
6/10
- - - 5.0 4 5.00 2 6 1.20
6/04
vs 
- - - 4.1 9 4.85 1 3 2.31
5/30
1 - - 5.0 1 2.00 3 5 0.80
5/24
- 1 - 4.0 5 4.50 0 4 1.25

Upcoming Games

dateOpptimeScheduled Starter
3/26
4:10 PM Not Announced Yet
3/28
4:10 PM Not Announced Yet
3/29
1:40 PM Not Announced Yet
3/30
12:00 AM Not Announced Yet
3/31
12:00 AM Not Announced Yet
4/01
12:00 AM Not Announced Yet
4/03
vs 
12:00 AM Not Announced Yet

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