Out
Injury Elbow
Est. Return 5/1/2026
2025 Stats
W-L
4-4
ERA
4.80
WHIP
1.49
K
68
SV
0
2026 Projections
2026 Fantasy Outlook
Birdsong began the season in the Giants' bullpen despite a strong showing in Cactus League play. He delivered a 2.31 ERA over 11 relief appearances before moving into the rotation, though the results were less stable than the ERA suggested. Over 23.1 innings, he issued 10 walks and surrendered four home runs. Those problems became more pronounced as a starter, where he posted a 6.17 ERA and 1.61 WHIP across 10 starts and 42.1 innings, accompanied by 27 walks. After being sent to Triple-A Sacramento, Birdsong continued to battle control, walking 30 in 39 innings with similarly poor run prevention. The Giants again have rotation depth questions, giving him another spring opportunity, but last season's command and control issues place him on the fringe. Even so, his age leaves room for improvement if he can regain consistency. Read Past Outlooks
Signed a one-year contract with the Giants in March of 2026.
Problem with UCL
Birdsong was diagnosed with a Grade 2 forearm strain and UCL sprain after undergoing an MRI on Sunday and will meet with Dr. Keith Meister for a second opinion, Justice delos Santos of The San Jose Mercury News reports.
Analysis
Susan Slusser of the San Francisco Chronicle reported Friday that the right-hander was headed for a second opinion for his arm injury, and that certainly makes sense, given the initial diagnosis. Birdsong is weighing the treatment options, and surgery seems likely to be on the table.
Susan Slusser of the San Francisco Chronicle reported Friday that the right-hander was headed for a second opinion for his arm injury, and that certainly makes sense, given the initial diagnosis. Birdsong is weighing the treatment options, and surgery seems likely to be on the table.
Pitching Stats
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2025 MLB Game Log
2025
2024
Minor League Game Log
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Pitching Appearances Breakdown
Average Pitch Count
57
Last 10 Games
81
Last 5 Games
71
How many pitches does Hayden Birdsong 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 Hayden Birdsong 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
-14%
BAA vs RHP
2025
-27%
BAA vs RHP
| BAA | K | BB | H | HR | ||||
|---|---|---|---|---|---|---|---|---|
| Since 2023vs Left | .245 | 81 | 49 | 67 | 11 | |||
| Since 2023vs Right | .210 | 75 | 31 | 51 | 10 | |||
| 2025vs Left | .281 | 33 | 21 | 34 | 7 | |||
| 2025vs Right | .206 | 35 | 16 | 27 | 3 | |||
| 2024vs Left | .217 | 48 | 28 | 33 | 4 | |||
| 2024vs Right | .214 | 40 | 15 | 24 | 7 | |||
| 2023vs Left | 0 | 0 | 0 | 0 | 0 | |||
| 2023vs Right | 0 | 0 | 0 | 0 | 0 | |||
| More Splits→ | View More Split Stats | |||||||
Home/Away Pitching Splits
Since 2023
-22%
ERA at Home
2025
-20%
ERA at Home
| ERA | WHIP | IP | K/9 | BB/9 | |||||
|---|---|---|---|---|---|---|---|---|---|
| Since 2023Home | 4.15 | 1.38 | 65.0 | 9.8 | 4.8 | ||||
| Since 2023Away | 5.33 | 1.49 | 72.2 | 10.5 | 5.6 | ||||
| 2025Home | 4.28 | 1.37 | 33.2 | 8.3 | 4.3 | ||||
| 2025Away | 5.34 | 1.63 | 32.0 | 10.4 | 5.9 | ||||
| 2024Home | 4.02 | 1.40 | 31.1 | 11.5 | 5.5 | ||||
| 2024Away | 5.31 | 1.38 | 40.2 | 10.6 | 5.3 | ||||
| 2023Home | 0 | 0 | 0 | 0 | 0 | ||||
| 2023Away | 0 | 0 | 0 | 0 | 0 | ||||
| More Splits→ | View More Split Stats | ||||||||
Stat Review
How does Hayden Birdsong 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
1.84K/9
9.3BB/9
5.1HR/9
1.4Fastball
95.6 mphERA
4.80WHIP
1.49BABIP
.303GB/FB
0.82Left On Base
66.7%Exit Velocity
83.1 mphBarrels/BBE
5.8%Spin Rate
2288 rpmBalls Hit 95+ MPH
27.7%Swinging Strike
11.4%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
2025
2024
Birdsong began last season at Double-A Richmond but wound up making 16 starts for the Giants. He flashed plenty of swing-and-miss ability with a 27.9 percent strikeout rate and a pair of double-digit strikeout outings, but the young right-hander also had an ugly 13.7 percent walk rate and completed six innings in just one of his 16 starts. Birdsong has three legitimate secondary pitches in his curveball, changeup and slider, with each garnering a whiff rate of at least 32.7 percent and all three offerings earning excellent Stuff+ grades. However, his Location+ of 92 was among the worst in baseball for a regular starter, which no doubt was the main reason why opponents had an obscene 50 percent hard-hit rate. There's legitimate upside with Birdsong and he could open 2025 in the Giants' rotation, but he'll have to improve his command and control to be a reliable option in fantasy.
More Fantasy News
Getting second opinion
Birdsong is getting a second opinion on the forearm discomfort he is dealing with, Susan Slusser of the San Francisco Chronicle reports.
Analysis
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Being evaluated for elbow injury
Birdsong is being evaluated for an elbow injury Thursday, Susan Slusser of The San Francisco Chronicle reports.
Analysis
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Struggles in Cactus League opener
Birdsong allowed five earned runs on three hits, including a home run, and two walks across one-third of an inning during Saturday's 10-5 Cactus League win over the Mariners.
Analysis
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Working on mechanics this offseason
Birdsong has been working on staying more upright with his delivery this offseason as he looks to improve his command, Susan Slusser of the San Francisco Chronicle reports.
Analysis
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Sent down after disastrous start
The Giants optioned Birdsong to Triple-A Sacramento on Tuesday, Shayna Rubin of the San Francisco Chronicle reports.
Analysis
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Latest Fantasy Rumors
Slated to start May 20
Birdsong is expected to start against the Royals on Tuesday, May 20, according to Susan Slusser of the San Francisco Chronicle.
Analysis
Things could change between now and Tuesday, but as of now, Birdsong is slated to move into the rotation and face the Royals in the second matchup of a three-game series following the demotion of Jordan Hicks to the bullpen. Birdsong posted a 4.75 ERA in 16 starts as a rookie in 2024, but he's been more effective as a reliever early in 2025 with a 2.31 ERA and 25:10 K:BB over 23.1 innings.
Things could change between now and Tuesday, but as of now, Birdsong is slated to move into the rotation and face the Royals in the second matchup of a three-game series following the demotion of Jordan Hicks to the bullpen. Birdsong posted a 4.75 ERA in 16 starts as a rookie in 2024, but he's been more effective as a reliever early in 2025 with a 2.31 ERA and 25:10 K:BB over 23.1 innings.