Pitcher · 2023
Zack Weiss
- Age
- 31
- B/T
- R/R
- Height
- 6' 3"
- Weight
- 210 lb
- Number
- #91
- Born
- June 16, 1992 in Irvine, CA, USA
- MLB debut
- April 12, 2018
- dbWAR
- -.2 3 season(s)
- IP
- 14.0
- ERA
- 3.21
- FIP
- 6.33
- K/9
- 9.6
- FIP−
- 146 100 = avg
Zack Weiss is a relief pitcher for the Boston Red Sox. In 2023 he struck out 15 batters over 14.0 innings across 12 appearances, going 1-0. His ERA of 3.21 was 25.8% lower than the league average of 4.33. Stripping out defence, his 6.33 FIP suggests that his ERA had some help behind him. He missed bats on 27.2% of swings (12.4% of every pitch he threw), walked 10.3% of the batters he faced and struck out 25.9%. 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, 2023.
Pitching
Standard and advanced, by season.
| Trend | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2023 | 12 | 0 | 14.0 | 1 | 0 | 0 | 9 | 5 | 15 | 6 | 3.21 | 6.33 | 1.07 | 9.6 | 3.9 | 74 | 146 | -0.2 | |
| 2022 | 12 | 0 | 13.1 | 0 | 1 | 0 | 7 | 5 | 18 | 7 | 3.38 | 4.16 | 1.05 | 12.1 | 4.7 | 85 | 105 | 0.0 | |
| 2018 | 1 | 0 | 0.0 | 0 | 0 | 0 | 2 | 4 | 0 | 2 | — | — | — | — | — | — | — | — |
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 | 18 | 15 | 3 | 2 | 3 | 2 | .200 | .333 | .600 | .388 | 11.1% |
| vs RHB | 40 | 35 | 6 | 2 | 3 | 13 | .171 | .250 | .371 | .269 | 32.5% |
Pitch sequencing
What Zack Weiss throws in each count, and what he follows each pitch with. Select any cell for the breakdown.
Select a count to see exactly what Zack Weiss throws in it.
Pitch arsenal
What he throws, how hard, and how often it misses in 2023.
| Sweeper | 144 | 83.8 | 2,539 | 50.0% | 33.8% | |
| Four-Seam Fastball | 66 | 94.1 | 2,438 | 47.0% | 12.0% | |
| Slider | 16 | 88.3 | 2,457 | 56.3% | 20.0% |
Head to head
Put Zack Weiss 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.