BOS · P
Greg Weissert
Age 31 B/T R/R 6′2″, 235 lb USA MLB debut 2022
- Boston’s roster as it stands on the 40-man, off the 26-man (call-up depth)
- Trade read Available at a price: BOS 76% playoff odds; control through 2029.
Keystone Stuff 100 50th pct
2026 fWAR 0.3
Projected 2027 WAR 0.3 Keystone Marcel+ at 67 IP
Pitching · 2026 percentiles
vs. MLB pitchers with 500+ pitches · 991 pitches
60.2 IP3.26 ERA3.97 FIP 13° arm1 SV
Arsenal & Pitch Lab
Movement normalized to arm side · Keystone Stuff by pitch
| Pitch | Use | Velo | IVB | HB | Stuff | Loc | Whiff | xRV/100 |
|---|---|---|---|---|---|---|---|---|
| Sinker35% use | 35% | 94.0 | 2.4 | +17.7 | 95 | 100 | 12% | +0.72 |
| Four-seam29% use | 29% | 94.1 | 11.3 | +9.8 | 101 | 106 | 24% | +1.60 |
| Changeup13% use | 13% | 85.2 | −4.4 | +15.2 | 92 | 105 | 45% | +0.83 |
| Sweeper13% use | 13% | 82.0 | 5.9 | −18.3 | 114 | 99 | 37% | −0.39 |
| Slider8% use | 8% | 85.5 | 3.0 | −4.8 | 108 | 83 | 10% | −2.75 |
| Curveball2% use | 2% | 81.8 | −6.2 | −14.4 | 101 | 96 | 0% | −4.92 |
No mix change or new pitch clears its bar. The arsenal is efficient for its shapes.
Most similar pitchers
Pitches like Weissert: same hand, shape, slot and mix
| Similarity | Player | Stuff | ’26 WAR | ’27 proj | 2027 |
|---|---|---|---|---|---|
| 41 | John Schreiber NYY · ’94 | 98 | −0.2 | 0.1 | Free agent |
| 38 | Grant Anderson MIL · ’97 | 96 | 0.2 | 0.1 | Arb |
| 35 | Kevin Kelly TB · ’97 | 100 | 1.4 | 0.6 | Arb |
| 29 | Colin Holderman CLE · ’95 | 109 | 0.8 | 0.3 | Arb |
| 26 | Austin Warren NYM · ’96 | 98 | 0.1 | 0.1 | Arb |
Same-handed pitchers nearest on fastball velocity and shape, arm angle, extension, pitch mix, secondary shapes, Stuff, whiff rate and workload. 2026 regulars only.
Pitch locations · 2026
Where each pitch finishes, by batter side
Where each pitch finishes, catcher’s view. The bar marks the batter’s side; the box is an average strike zone. Pitches with 40+ thrown to this side.
Contract & projection
Club control (RosterResource) · Keystone projected WAR
2027 0.3 WAR Arbitration $1.6M*
2028 0.2 WAR Arbitration $2.1M*
2029 0.0 WAR Arbitration $2.1M*
2030 −0.1 WAR Free agent
* projected arbitration or minimum salary. Contract Studio →