Players · B · Pitcher · 2026 regular season
Aaron Bummer
- Age
- 33
- B/T
- L/L
- Height
- 6' 3"
- Weight
- 215 lb
- Number
- #36
- Born
- September 21, 1993 in Valencia, CA, United States
- MLB debut
- July 27, 2017
- Drafted
- 2011, round 31
- College
- Nebraska
- High school
- Sunrise Mountain
- Salary, 2026
- $9.5M
- dbWAR
- 5.9 Regular season, 10 season(s)
- IP
- 16.2
- ERA
- 10.26
- FIP
- 9.16
- K/9
- 7.0
- FIP−
- 219 100 = avg
Aaron Bummer is a relief pitcher for the Atlanta Braves. In 2026 he struck out 13 batters over 16.2 innings across 21 appearances, going 1-2. His ERA of 10.26 was 145.4% higher than the league average of 4.18. Stripping out defence, his 9.16 FIP suggests he pitched better than his ERA shows. He missed bats on 19.5% of swings (9.1% of every pitch he threw), walked 12.5% of the batters he faced and struck out 14.8%. His -0.9 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, 2026 regular season.
WAR by season
Pitching Regular season
Standard and advanced, by season. Regular-season games only — postseason games are listed separately below.
| Trend | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | ATL/KC | 21 | 0 | 16.2 | 1 | 2 | 0 | 24 | 19 | 13 | 11 | 10.26 | 9.16 | 2.10 | 7.0 | 5.9 | 245 | 219 | -0.9 | |
| 2025 | ATL | 42 | 2 | 54.1 | 3 | 2 | 0 | 51 | 23 | 51 | 17 | 3.81 | 3.52 | 1.25 | 8.4 | 2.8 | 92 | 85 | 0.7 | |
| 2024 | ATL | 56 | 0 | 55.1 | 4 | 3 | 0 | 61 | 22 | 69 | 18 | 3.58 | 2.23 | 1.43 | 11.2 | 2.9 | 88 | 55 | 1.5 | |
| 2023 | CWS | 61 | 0 | 58.1 | 5 | 5 | 0 | 53 | 44 | 78 | 36 | 6.79 | 3.58 | 1.53 | 12.0 | 5.6 | 157 | 83 | 0.8 | |
| 2022 | CWS | 32 | 0 | 26.2 | 2 | 1 | 2 | 30 | 7 | 30 | 10 | 2.36 | 3.19 | 1.50 | 10.1 | 3.4 | 60 | 80 | 0.4 | |
| 2021 | CWS | 62 | 0 | 56.1 | 5 | 5 | 2 | 42 | 22 | 75 | 29 | 3.51 | 2.96 | 1.26 | 12.0 | 4.6 | 82 | 69 | 1.2 | |
| 2020 | CWS | 9 | 0 | 9.1 | 1 | 0 | 0 | 5 | 1 | 14 | 5 | 0.96 | 1.80 | 1.07 | 13.5 | 4.8 | 22 | 40 | 0.3 | |
| 2019 | CWS | 58 | 0 | 67.2 | 0 | 0 | 1 | 43 | 16 | 60 | 24 | 2.13 | 3.41 | 0.99 | 8.0 | 3.2 | 47 | 76 | 1.2 | |
| 2018 | CWS | 37 | 0 | 31.2 | 0 | 1 | 0 | 40 | 15 | 35 | 10 | 4.26 | 2.40 | 1.58 | 9.9 | 2.8 | 103 | 58 | 0.8 | |
| 2017 | CWS | 30 | 0 | 22.0 | 1 | 3 | 0 | 13 | 11 | 17 | 15 | 4.50 | 6.16 | 1.27 | 7.0 | 6.1 | 103 | 141 | -0.3 |
Separate from the regular season
Postseason Postseason
Wild Card through World Series. These games are counted on their own: none of them are in the regular-season tables, career totals, league context, leaderboards or dbWAR on this page.
Postseason pitching
| Season | Team | Round | G | GS | IP | W | L | SV | H | ER | HR | BB | SO | ERA | WHIP | K/9 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2024 Post | ATL | Wild Card | 1 | 0 | 2.2 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 0.00 | 0.38 | 3.4 |
| 2021 Post | CWS | ALDS | 3 | 0 | 3.1 | 0 | 1 | 0 | 5 | 3 | 0 | 1 | 7 | 8.10 | 1.80 | 18.9 |
| 2020 Post | CWS | Wild Card | 2 | 0 | 1.1 | 0 | 0 | 0 | 1 | 0 | 0 | 1 | 1 | 0.00 | 1.50 | 6.8 |
| Career | Postseason total · 3 Octobers | 6 | 0 | 7.1 | 0 | 1 | 0 | 6 | 3 | 0 | 3 | 9 | 3.68 | 1.23 | 11.0 |
Box-score and rate statistics only. wOBA, wRC+, FIP and dbWAR are measured against a full league season, and a postseason is a few teams playing each other for a month, so they are not computed for October.
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 | 44 | 37 | 12 | 3 | 6 | 7 | .324 | .419 | .676 | .463 | 15.9% |
| vs RHB | 44 | 37 | 12 | 4 | 5 | 6 | .324 | .409 | .676 | .454 | 13.6% |
Pitch sequencing
What Aaron Bummer throws in each count, and what he follows each pitch with. Select any cell for the breakdown.
Select a count to see exactly what Aaron Bummer throws in it.
Pitch arsenal
What he throws, how hard, how often it misses, and what hitters do with it.
| Sinker | 127 | 90.3 | 1,997 | 48.8% | 11.5% | 25 | .400 | 1.316 | |
| Sweeper | 71 | 80.6 | 2,301 | 43.7% | 33.3% | 16 | .313 | 1.040 | |
| Curveball | 70 | 80.2 | 2,298 | 40.0% | 17.1% | 21 | .286 | .946 | |
| Cutter | 33 | 87.7 | 2,162 | 57.6% | 20.0% | 6 | — | — | |
| Four-Seam Fastball | 27 | 90.6 | 2,173 | 22.2% | 12.5% | 6 | — | — |
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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.