Pitcher · 2026
Geoff Hartlieb
- Age
- 33
- B/T
- R/R
- Height
- 6' 5"
- Weight
- 240 lb
- Number
- #31
- Born
- December 9, 1993 in Highland, IL, USA
- MLB debut
- May 18, 2019
- Drafted
- 2015, round 37
- College
- Lindenwood
- dbWAR
- -.4 3 season(s)
- IP
- 13.1
- ERA
- 6.07
- FIP
- 5.19
- K/9
- 4.0
- FIP−
- 124 100 = avg
Geoff Hartlieb is a relief pitcher for the Athletics. In 2026 he struck out 6 batters over 13.1 innings across 8 appearances, going 1-1. His ERA of 6.07 was 45.5% higher than the league average of 4.18. Stripping out defence, his 5.19 FIP suggests he pitched better than his ERA shows. He missed bats on 24.5% of swings (11.5% of every pitch he threw), walked 14.1% of the batters he faced and struck out 9.4%. 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, 2026.
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 | 31 | 25 | 7 | 0 | 5 | 3 | .280 | .387 | .400 | .355 | 9.7% |
| vs RHB | 33 | 27 | 10 | 1 | 4 | 3 | .370 | .424 | .630 | .438 | 9.1% |
Pitch sequencing
What Geoff Hartlieb throws in each count, and what he follows each pitch with. Select any cell for the breakdown.
Select a count to see exactly what Geoff Hartlieb throws in it.
Pitch arsenal
What he throws, how hard, and how often it misses in 2026.
| Four-Seam Fastball | 78 | 95.2 | 2,292 | 35.9% | 11.8% | |
| Slider | 66 | 84.5 | 2,460 | 39.4% | 37.9% | |
| Cutter | 39 | 91.4 | 2,463 | 28.2% | 15.0% | |
| Sinker | 34 | 93.6 | 2,282 | 38.2% | 36.8% |
Pitching
Standard and advanced, by season.
| Trend | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 8 | 0 | 13.1 | 1 | 1 | 0 | 17 | 9 | 6 | 9 | 6.07 | 5.19 | 1.95 | 4.0 | 6.1 | 145 | 124 | -0.1 | |
| 2025 | 4 | 0 | 3.1 | 0 | 0 | 0 | 8 | 8 | 5 | 6 | 21.60 | 13.34 | 4.20 | 13.5 | 16.2 | 519 | 321 | -0.3 | |
| 2024 | 5 | 0 | 9.0 | 0 | 0 | 0 | 13 | 9 | 7 | 4 | 9.00 | 4.39 | 1.89 | 7.0 | 4.0 | 221 | 108 | 0.0 |
Head to head
Put Geoff Hartlieb beside up to three others.
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.