2025 Stats
W-L
1-0
ERA
2.31
WHIP
1.29
K
25
SV
0
Rest-of-Season Projections
2025 Fantasy Outlook
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. Read Past Outlooks
Joining rotation
Manager Bob Melvin announced Saturday that Birdsong will replace Jordan Hicks in the Giants' rotation, Alex Pavlovic of NBC Sports Bay Area reports.
ANALYSIS
Birdsong lost the race for a rotation spot during spring training, but his 2.31 ERA and 1.29 WHIP across 23.1 innings out of the bullpen, combined with Hicks' struggles as a starter, will cause the two pitchers to swap roles. Birdsong's first start of the season will come Tuesday against the Royals, who own the fourth-lowest scoring offense (157 runs) and sixth-worst OPS (.662) in the majors.
Birdsong lost the race for a rotation spot during spring training, but his 2.31 ERA and 1.29 WHIP across 23.1 innings out of the bullpen, combined with Hicks' struggles as a starter, will cause the two pitchers to swap roles. Birdsong's first start of the season will come Tuesday against the Royals, who own the fourth-lowest scoring offense (157 runs) and sixth-worst OPS (.662) in the majors.
Pitching Stats
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2025
2024
Minor League Game Log
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Pitching Appearances Breakdown
Average Pitch Count
35
Last 10 Games
36
Last 5 Games
40
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
-7%
BAA vs RHP
2025
-24%
BAA vs RHP
| BAA | K | BB | H | HR | ||||
|---|---|---|---|---|---|---|---|---|
| Since 2023vs Left | .227 | 60 | 35 | 44 | 6 | |||
| Since 2023vs Right | .210 | 53 | 18 | 33 | 9 | |||
| 2025vs Left | .262 | 12 | 7 | 11 | 2 | |||
| 2025vs Right | .200 | 13 | 3 | 9 | 2 | |||
| 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
-36%
ERA at Home
2025
-54%
ERA at Home
| ERA | WHIP | IP | K/9 | BB/9 | |||||
|---|---|---|---|---|---|---|---|---|---|
| Since 2023Home | 3.23 | 1.31 | 47.1 | 10.8 | 4.8 | ||||
| Since 2023Away | 5.06 | 1.42 | 48.0 | 10.5 | 5.3 | ||||
| 2025Home | 1.69 | 1.13 | 16.0 | 9.6 | 3.4 | ||||
| 2025Away | 3.68 | 1.64 | 7.1 | 9.8 | 4.9 | ||||
| 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 relievers?
This section compares his stats with all relief pitcher seasons from the previous three seasons (minimum 30 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 30 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 30 IP). See here for more exit velocity/barrels stats plus an explanation of current limitations with that data set.
K/BB
2.50K/9
9.6BB/9
3.9HR/9
1.5Fastball
96.2 mphERA
2.31WHIP
1.29BABIP
.282GB/FB
0.71Left On Base
82.0%Exit Velocity
82.4 mphBarrels/BBE
6.1%Spin Rate
2246 rpmBalls Hit 95+ MPH
29.6%Swinging Strike
13.2%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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2024 Fantasy Outlook
Known for his premium stuff and wild control heading into 2023, Birdsong kept the starting pitching dream alive by throwing more strikes than expected as a 21-year-old at Single-A and High-A. From April 26 through July 30, Birdsong had a 2.48 ERA, 1.06 WHIP, 100 strikeouts and 25 walks in 69 innings. That dominant run was book-ended by some struggles, particularly a 12.5 percent walk rate in 23 innings after a late-season promotion to Double-A. Birdsong's stuff and potential home park are still an alluring combination in dynasty leagues. The 6-foot-4 righty boasts a plus mid-90s fastball, a potentially plus low-80s curveball and a solid slider. If he shows improved control in a return to Double-A, Birdsong will have an up arrow next to his name as a potential high-strikeout mid-rotation starter who could reach the majors in late 2024 or early 2025. An eventual move to relief remains a possibility.
More Fantasy News
Logs season-high three earned runs
Birdsong allowed three earned runs on four hits (two home runs) and two walks while striking out three across three innings of relief in Wednesday's 8-7 loss to the Diamondbacks. He also hit a batter and uncorked a wild pitch.
ANALYSIS
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Struggles in defeat
Birdsong was charged with five runs (one earned) on two walks and two hits over one-third of an inning during Monday's 9-2 loss to the Cubs.
ANALYSIS
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Fans five in scoreless outing
Birdsong threw three scoreless innings during Sunday's 3-2 win over the Rangers, allowing three hits while striking out five.
ANALYSIS
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Earns first win of 2025
Birdsong (1-0) picked up the win in Monday's 5-2 victory over the Brewers, allowing a hit and two walks while striking out four in three innings.
ANALYSIS
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Allows two runs vs. Philadelphia
Birdsong was charged with two earned runs on two hits and a walk over one inning during Tuesday's 6-4 loss to the Phillies.
ANALYSIS
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Latest Fantasy Rumors
Slated to start on 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.