Pitcher · 2025
Hayden Birdsong
- Age
- 24
- B/T
- R/R
- Height
- 6' 5"
- Weight
- 225 lb
- Number
- #60
- Born
- August 30, 2001 in Mattoon, IL, USA
- MLB debut
- June 26, 2024
- Drafted
- 2022, round 6
- College
- Eastern Illinois
- dbWAR
- .2 2 season(s)
- IP
- 65.2
- ERA
- 4.80
- FIP
- 4.96
- K/9
- 9.3
- FIP−
- 119 100 = avg
Hayden Birdsong is a relief pitcher for the San Francisco Giants. In 2025 he struck out 68 batters over 65.2 innings across 21 appearances, going 4-4. His ERA of 4.80 was 15.4% higher than the league average of 4.16 — 17th of 19 on his team, and 393rd of 542 among MLB pitchers with 20+ innings. Stripping out defence, his 4.96 FIP suggests the ERA was no fluke. He missed bats on 28.4% of swings (12.4% of every pitch he threw), walked 12.4% of the batters he faced and struck out 22.8%. His -0.1 dbWAR is built from that FIP rather than runs allowed, so it credits him for what he controls and not for the defence behind him.
League context
Percentile among qualified pitchers, 2025.
Platoon splits
How left- and right-handed hitters fare against him.
| Split | PA | AB | H | HR | BB | SO | AVG | OBP | SLG | wOBA | K% |
|---|---|---|---|---|---|---|---|---|---|---|---|
| vs LHB | 146 | 121 | 34 | 7 | 21 | 33 | .281 | .386 | .562 | .403 | 22.6% |
| vs RHB | 152 | 131 | 27 | 3 | 16 | 35 | .206 | .309 | .298 | .282 | 23.0% |
Pitch sequencing
What Hayden Birdsong throws in each count, and what he follows each pitch with. Select any cell for the breakdown.
Select a count to see exactly what Hayden Birdsong throws in it.
Pitch arsenal
What he throws, how hard, and how often it misses in 2025.
| Four-Seam Fastball | 527 | 95.5 | 2,403 | 42.9% | 21.1% | |
| Slider | 291 | 88.9 | 2,385 | 47.4% | 30.4% | |
| Changeup | 201 | 88.7 | 1,318 | 36.8% | 39.8% | |
| Curveball | 155 | 80.3 | 2,821 | 44.5% | 36.0% | |
| Slurve | 20 | 84.7 | 2,651 | 40.0% | 22.2% |
Pitching
Standard and advanced, by season.
| Trend | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025 | 21 | 10 | 65.2 | 4 | 4 | 0 | 61 | 35 | 68 | 37 | 4.80 | 4.96 | 1.49 | 9.3 | 5.1 | 115 | 119 | -0.1 | |
| 2024 | 16 | 16 | 72.0 | 5 | 6 | 0 | 57 | 38 | 88 | 43 | 4.75 | 4.67 | 1.39 | 11.0 | 5.4 | 116 | 114 | 0.3 |
Head to head
Put Hayden Birdsong beside up to three others.
Similar players
Nearest 2025 seasons by command, run prevention and role, on rate statistics rather than totals.
wOBA uses linear weights measured from this season's own play-by-play rather than published constants, and wRC+ is park-adjusted against that same league. dbWAR is our own open implementation — not fWAR or bWAR — and the full derivation, including its simplifications, is on the methodology page.