2025 Stats
W-L
1-1
ERA
4.04
WHIP
1.37
K
38
SV
0
Rest-of-Season Projections
2025 Fantasy Outlook
During his days in the minors when he became a top prospect, Harrison posted an ugly 12.3 percent walk rate but also a whopping 37.4 percent strikeout rate. Both of those numbers have come way down in the majors, with the lefty issuing walks at just a 7.8 percent clip but also fanning batters at a pedestrian 22.5 percent rate. Harrison's velocity also dipped in 2024 across the board and was down even more from August on when he posted a 7.76 ERA over six starts before he ended the season on the injured list with shoulder inflammation. Because it gets so much horizontal movement after he dropped his arm slot, Harrison's four-seamer still played well in spite of the lesser velocity, with the pitch earning a plus-seven Run Value. That said, the profile on the whole doesn't look as exciting as it did a year ago. Read Past Outlooks

Hit hard in no-decision
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.
Analysis
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.
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.
Pitching Stats
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2025 MLB Game Log
2025
2024
2023
Minor League Game Log
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Pitching Appearances Breakdown
Average Pitch Count
53
Last 10 Games
58
Last 5 Games
75
How many pitches does Kyle Harrison generally throw?
1-10
11-20
21-30
31-40
41-50
51-60
61-70
71-80
81-90
91-100
101-110
111-120
121+
What part of the game does Kyle Harrison generally pitch?
1st
2nd
3rd
4th
5th
6th
7th
8th
9th
Extra
% Games Reaching Innings Threshold
% Games By Number of Innings Pitched
Left/Right Pitching Splits
Since 2023
-7%
BAA vs RHP
2025
-8%
BAA vs LHP
BAA | K | BB | H | HR | ||||
---|---|---|---|---|---|---|---|---|
Since 2023vs Left | .268 | 41 | 11 | 48 | 9 | |||
Since 2023vs Right | .248 | 150 | 56 | 141 | 21 | |||
2025vs Left | .234 | 10 | 0 | 11 | 3 | |||
2025vs Right | .255 | 28 | 14 | 24 | 1 | |||
2024vs Left | .260 | 29 | 6 | 25 | 3 | |||
2024vs Right | .263 | 89 | 36 | 100 | 15 | |||
2023vs Left | .333 | 2 | 5 | 12 | 3 | |||
2023vs Right | .179 | 33 | 6 | 17 | 5 | |||
More Splits→ | View More Split Stats |
Home/Away Pitching Splits
Since 2023
-2%
ERA at Home
2025
-78%
ERA on Road
ERA | WHIP | IP | K/9 | BB/9 | |||||
---|---|---|---|---|---|---|---|---|---|
Since 2023Home | 4.35 | 1.34 | 93.0 | 9.6 | 2.7 | ||||
Since 2023Away | 4.43 | 1.29 | 101.2 | 8.1 | 3.5 | ||||
2025Home | 9.31 | 2.28 | 9.2 | 10.2 | 3.7 | ||||
2025Away | 2.08 | 1.04 | 26.0 | 9.3 | 3.5 | ||||
2024Home | 4.14 | 1.29 | 63.0 | 9.3 | 2.4 | ||||
2024Away | 4.99 | 1.40 | 61.1 | 7.8 | 3.7 | ||||
2023Home | 2.66 | 1.08 | 20.1 | 10.2 | 3.1 | ||||
2023Away | 6.28 | 1.26 | 14.1 | 7.5 | 2.5 | ||||
More Splits→ | View More Split Stats |
Stat Review
How does Kyle Harrison compare to other starting pitchers?
This section compares his stats with all starting pitcher seasons from the previous three seasons (minimum 120 innings)*. The bar represents the player's percentile rank. For example, if the bar is halfway across, then the player falls into the 50th percentile for that stat and it would be considered average.
* Exit Velocity, Barrels/BBE %, Balls Hit 95+ MPH %, and Spin Rate are benchmarked against 2019 data (min 120 IP). See here for more exit velocity/barrels stats plus an explanation of current limitations with that data set.
* Exit Velocity, Barrels/BBE %, Balls Hit 95+ MPH %, and Spin Rate are benchmarked against 2019 data (min 120 IP). See here for more exit velocity/barrels stats plus an explanation of current limitations with that data set.
K/BB
2.71K/9
9.6BB/9
3.5HR/9
1.0Fastball
94.6 mphERA
4.04WHIP
1.37BABIP
.331GB/FB
1.22Left On Base
76.0%Exit Velocity
82.5 mphBarrels/BBE
4.5%Spin Rate
2223 rpmBalls Hit 95+ MPH
24.0%Swinging Strike
12.3%Prospect Rankings History
Advanced Pitching Stats
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Defensive Stats
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Stats Vs Today's Lineup
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Past Fantasy Outlooks
2024
2023
2022
Harrison walked three or more batters in 11 of his 20 starts at Triple-A, where automated balls and strikes may have increased walk rates relative to when humans are calling the game. He walked at least one batter but no more than two batters in all seven of his big-league starts, which lends credence to the theory that he may have less of a control issue when the human element is involved. Harrison always missed bats at an elite clip in the minors, with strikeout rates north of 35 percent at every stop. However his propensity to walk batters has held him back at times. The gap between his walk rate at Triple-A (16.3 percent) and the big leagues (7.5 percent) is essentially the difference between a pitcher destined for relief and a pitcher who comfortably projects as a starter. The 6-foot-2 southpaw was the third-youngest pitcher to make five-plus starts in the majors (only Eury Perez and AJ Smith-Shawver were younger), so it's fair to expect further skill development in the coming years for Harrison, who won't turn 23 until August. He is a flyball pitcher (26.8 GB% in the big leagues), but he has a good home park for that approach, as Oracle Park has the third-lowest home run park factor, per Baseball Savant's 3-year rolling average. He should make the rotation out of spring training, but a hamstring injury limited him to 102.1 innings, so the Giants may cap him at around 150 innings in the regular season.
More Fantasy News

In line for another start
Harrison is slated to start Friday's game against the Tigers in Boston.
Analysis
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Impressive in first start
Harrison didn't factor into the decision Saturday's 6-3 win over the Rays, striking out five while allowing one earned run on four hits and two walks in six innings.
Analysis
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In line to start Saturday
Red Sox manager Alex Cora said that Harrison will start Saturday's game against the Rays in Tampa, Jen McCaffrey of The Athletic reports.
Analysis
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Makes Boston debut
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.
Analysis
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Recalled to big leagues
The Red Sox recalled Harrison from Triple-A Worcester on Wednesday.
Analysis
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Latest Fantasy Rumors

In mix for rotation spot
Harrison is a candidate to enter San Francisco's rotation after Justin Verlander was placed on the injured list due to a pectoral injury Thursday, reports Alex Pavlovic of NBC Sports Bay Area.
Analysis
Harrison was called up in early May after missing out on the Opening Day rotation, and he's pitched well in four apperarances with a 3.38 ERA, 0.94 WHIP and 7:3 K:BB over 5.1 innings. The left-hander might be limited to about 50 pitches if called upon to start Saturday in Washington. Harrison had a 4.56 ERA over 24 starts in the majors last season, which was a decent showing for his first full season in the big leagues.
Harrison was called up in early May after missing out on the Opening Day rotation, and he's pitched well in four apperarances with a 3.38 ERA, 0.94 WHIP and 7:3 K:BB over 5.1 innings. The left-hander might be limited to about 50 pitches if called upon to start Saturday in Washington. Harrison had a 4.56 ERA over 24 starts in the majors last season, which was a decent showing for his first full season in the big leagues.