Hayden Birdsong

Hayden Birdsong

23-Year-Old PitcherRP
San Francisco Giants
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
RANKS
Rest of Season From Preseason
#366
ADP
$Signed a one-year contract with the Giants in March of 2025.
Fans five in scoreless outing
PSan Francisco Giants
April 28, 2025
Birdsong threw three scoreless innings during Sunday's 3-2 win over the Rangers, allowing three hits while striking out five.
ANALYSIS
Birdsong entered the game in the sixth frame, surrendering a triple to the first batter he faced. However, he settled in and retired the next three hitters. The 23-year-old also allowed a double and a single over his three innings but racked up a season-high five strikeouts. Birdsong owns a 1.13 ERA, 1.06 WHIP and an 18:6 K:BB across 16.0 innings in seven games. The right-hander has been impressive to start the 2025 campaign and will likely continue to serve in a long-relief role.
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Pitching Stats
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2025
2024
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2024 MLB Game Log
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Pitching Appearances Breakdown
Average Pitch Count
34
Last 10 Games
34
Last 5 Games
36
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+
 
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+
 
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
 
 
 
1st
 
 
 
2nd
 
 
 
3rd
 
 
 
4th
 
 
 
5th
 
 
 
6th
 
 
 
7th
 
 
 
8th
 
 
 
9th
 
Extra
 
 
 
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
 
 
-9%
BAA vs RHP
2025
 
 
-35%
BAA vs RHP
2024
 
 
-1%
BAA vs RHP
2023
No Stats
BAA Batters K BB H 2B 3B HR
Since 2023vs Left .220 214 56 31 39 7 3 5
Since 2023vs Right .201 165 50 18 29 6 0 7
2025vs Left .240 28 8 3 6 2 2 1
2025vs Right .156 36 10 3 5 0 0 0
2024vs Left .217 186 48 28 33 5 1 4
2024vs Right .214 129 40 15 24 6 0 7
2023vs Left 0 0 0 0 0 0 0 0
2023vs Right 0 0 0 0 0 0 0 0
More Splits View More Split Stats
Home/Away Pitching Splits
Since 2023
 
 
-42%
ERA at Home
2025
 
 
-100%
ERA at Home
2024
 
 
-24%
ERA at Home
2023
No Stats
ERA WHIP IP W L SV K/9 BB/9 HR/9
Since 2023Home 2.98 1.30 42.1 2 3 0 11.3 4.9 1.1
Since 2023Away 5.12 1.36 45.2 4 3 0 10.4 5.1 1.4
2025Home 0.00 1.00 11.0 1 0 0 10.6 3.3 0.0
2025Away 3.60 1.20 5.0 0 0 0 9.0 3.6 1.8
2024Home 4.02 1.40 31.1 1 3 0 11.5 5.5 1.4
2024Away 5.31 1.38 40.2 4 3 0 10.6 5.3 1.3
2023Home 0 0 0 0 0 0 0 0 0
2023Away 0 0 0 0 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.
  • K/BB
    Strikeout to walk ratio.
  • K/9
    Average strikeouts per nine innings.
  • BB/9
    Average walks per nine innings.
  • HR/9
    Average home runs allowed per nine innings.
  • Fastball
    Average fastball velocity.
  • ERA
    Earned run average. The average earned runs allowed per nine innings.
  • WHIP
    Walks plus hits per inning pitched.
  • BABIP
    Batting average on balls in play. Measures how many balls in play against a pitcher go for hits.
  • GB/FB
    Groundball to flyball ratio. The higher the number, the more likely a pitcher is to induce groundballs.
  • Left On Base
    The percentage of base runners that a pitcher strands on base over the course of a season.
  • Exit Velocity
    The speed of the baseball as it comes off the bat, immediately after a batter makes contact.
  • Barrels/BBE
    The percentage of batted ball events resulting in a Barrel. A Barrel is a batted ball with similar exit velocity and launch angle to past ones that led to a minimum .500 batting average and 1.500 slugging percentage.
  • Spin Rate
    Spin Rate is the rate of spin on a baseball after it is released. It is measured in revolutions per minute (rpm).
  • Balls Hit 95+ MPH
    The percentage of batted balls hit that met or exceeded the 95 MPH threshold.
  • Swinging Strike
    The percentage of pitches that result in a swing and a miss.
K/BB
3.00
 
K/9
10.1
 
BB/9
3.4
 
HR/9
0.6
 
Fastball
96.4 mph
 
ERA
1.13
 
WHIP
1.06
 
BABIP
.269
 
GB/FB
0.80
 
Left On Base
96.2%
 
Exit Velocity
80.6 mph
 
Barrels/BBE
5.4%
 
Spin Rate
2233 rpm
 
Balls Hit 95+ MPH
25.0%
 
Swinging Strike
14.8%
 
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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Recent RotoWire Articles Featuring Hayden Birdsong See More
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8 days ago
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29 days ago
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32 days ago
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Spring Training Job Battles: National League Update
35 days ago
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NL FAAB Factor: Waiver Pickups of the Week
36 days ago
Jan Levine has a slightly smaller rundown of NL options than last week to get you prepared for the North American start to the regular season.
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
Earns first win of 2025
PSan Francisco Giants
April 22, 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
PSan Francisco Giants
April 15, 2025
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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Still unscored upon
PSan Francisco Giants
April 13, 2025
Birdsong picked up a hold during Sunday's 5-4 win over the Yankees, tossing two scoreless innings while striking out three and hitting one batter.
ANALYSIS
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Strong start to season continues
PSan Francisco Giants
April 8, 2025
Birdsong threw three scoreless innings during Tuesday's 1-0 loss to the Reds, allowing a hit and a walk while striking out two.
ANALYSIS
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Makes first appearance of 2025
PSan Francisco Giants
April 3, 2025
Birdsong threw two scoreless innings during Wednesday's 6-3 win over the Astros, allowing two hits with two strikeouts and a walk.
ANALYSIS
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