Pitcher · 2026
Greg Weissert
- Age
- 31
- B/T
- R/R
- Height
- 6' 2"
- Weight
- 235 lb
- Number
- #57
- Born
- February 4, 1995 in Bay Shore, NY, USA
- MLB debut
- August 25, 2022
- Drafted
- 2016, round 18
- College
- Fordham
- High school
- Bay Shore
- dbWAR
- 1.5 3 season(s)
- IP
- 45.1
- ERA
- 3.97
- FIP
- 4.21
- K/9
- 8.7
- FIP−
- 101 100 = avg
Greg Weissert is a relief pitcher for the Boston Red Sox. In 2026 he struck out 44 batters over 45.1 innings across 48 appearances, going 3-2. His ERA of 3.97 was 4.9% lower than the league average of 4.18 — 12th of 17 on his team, and 244th of 467 among MLB pitchers with 20+ innings. Stripping out defence, his 4.21 FIP suggests the ERA was no fluke. He missed bats on 22.7% of swings (11.2% of every pitch he threw), walked 7.3% of the batters he faced and struck out 23.0%. His 0.2 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 | 69 | 61 | 19 | 2 | 8 | 12 | .311 | .391 | .475 | .378 | 17.4% |
| vs RHB | 122 | 112 | 23 | 5 | 6 | 32 | .205 | .256 | .357 | .270 | 26.2% |
Pitch sequencing
What Greg Weissert throws in each count, and what he follows each pitch with. Select any cell for the breakdown.
Select a count to see exactly what Greg Weissert throws in it.
Pitch arsenal
What he throws, how hard, and how often it misses in 2026.
| Sinker | 272 | 93.9 | 2,130 | 50.7% | 14.1% | |
| Four-Seam Fastball | 211 | 93.9 | 2,280 | 49.8% | 22.7% | |
| Sweeper | 103 | 81.8 | 2,884 | 44.7% | 38.6% | |
| Changeup | 75 | 85.3 | 1,609 | 45.3% | 38.6% | |
| Slider | 59 | 85.3 | 2,543 | 52.5% | 10.5% | |
| Curveball | 18 | 81.6 | 2,624 | 11.1% | 0.0% |
Pitching
Standard and advanced, by season.
| Trend | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 48 | 0 | 45.1 | 3 | 2 | 1 | 42 | 20 | 44 | 14 | 3.97 | 4.21 | 1.24 | 8.7 | 2.8 | 95 | 101 | 0.2 | |
| 2025 | 72 | 0 | 67.0 | 6 | 6 | 4 | 57 | 21 | 57 | 21 | 2.82 | 3.67 | 1.16 | 7.7 | 2.8 | 68 | 88 | 0.7 | |
| 2024 | 62 | 0 | 63.1 | 4 | 2 | 1 | 65 | 22 | 58 | 20 | 3.13 | 3.72 | 1.34 | 8.2 | 2.8 | 77 | 91 | 0.6 |
Head to head
Put Greg Weissert beside up to three others.
Similar players
Nearest 2026 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.