Christian Koss
- San Francisco’s roster as it stands on the 40-man, off the 26-man (call-up depth)
Hitting · 2026
221 PA: percentiles need 300+, so values only
Platoon splits · swing path
By pitcher handedness
| vs | PA | wOBA | xwOBA | K% | BB% | Chase | Decisions | Contact |
|---|---|---|---|---|---|---|---|---|
| LHP | 68 | .274 | .205 | 26% | 3% | 41% | −1.40 | −3.22 |
| RHP | 153 | .267 | .257 | 27% | 5% | 39% | −1.80 | −1.62 |
- Attack angle
- 10.1° (57% in 5–20°)
- Attack direction
- +3.1°
- Swing length
- 7.1 ft
- Fast-swing rate
- 5%
- Pull-air %
- 12.6%
- Hard-hit %
- 26.9%
- Slash · wRC+
- .217/.257/.305 · 58
Zone map · 2026
Where he does damage, and where to pitch him
Does the most damage down and in (+3.9 vs. league per 100; 1.8 standard errors on 20 pitches, inside the noise for the best of nine cells).
Weakest middle-middle (−4.0), but only 1.8 standard errors from average on 55 pitches: no in-zone spot to attack yet.
Runs per 100 pitches vs. an average RHB: better · worse. Catcher’s view · 704 pitches · faded cells are within one standard error of average. A spot is called only when it is farther from average than the best or worst of nine average cells gets 95% of the time (set from the league’s own pitches: about 3 standard errors above, 2 below).
Most similar hitters
Swings like Koss: bat path, contact quality and approach
| Similarity | Player | xwOBA | ’26 WAR | ’27 proj | 2027 |
|---|---|---|---|---|---|
| 67 | José Caballero NYY · ’96 | .279 | 1.3 | 1.5 | Arb |
| 53 | Andrés Giménez TOR · ’98 | .276 | 2.8 | 1.9 | Signed $23.6M |
| 53 | Ceddanne Rafaela BOS · ’00 | .288 | 4.1 | 3.0 | Signed $3.8M |
| 46 | Trevor Story BOS · ’92 | .248 | 0.2 | 0.8 | Signed $25.0M |
| 46 | Nathan Church STL · ’00 | .284 | 0.4 | 0.6 | Pre-arb |
Nearest neighbours on bat speed, swing length, attack angle, squared-up and blast rates, EV90, barrels, pull-air, chase, zone contact, K% and BB%. 2026 regulars only.
Fielding
2027 rating at every position he can play · OAA by position · range by direction · tools. Same engine as the Fielding Lab and the Winter Plan.
| Season | Pos | OAA | Range | Arm, DP | Runs | Batters |
|---|---|---|---|---|---|---|
| 2026 | 2B | 0 | 0 | 0.0 | 0.0 | 133 |
| 2026 | 3B | +2 | +1 | −0.1 | +0.9 | 679 |
| 2026 | SS | 0 | 0 | −0.3 | −0.3 | 1,489 |
| 2025 | SS | −1 | −1 | +0.1 | −0.9 | 139 |
| 2025 | 3B | 0 | 0 | +0.2 | +0.2 | 294 |
| 2025 | 2B | 0 | 0 | +1.1 | +1.1 | 1,430 |
Runs = range plus his arm and double-play runs spread over his positions by outs (Fielding Run Value, from 2023): what the rating counts.
| Season | Zone | Balls | Outs vs. exp. |
|---|---|---|---|
| 2026 | SS | 146 | +1.6 |
| 2026 | 3B | 60 | +2.7 |
| 2025 | 2B | 162 | +6.7 |
The zone rating counts every ball hit to his part of the field while he played there, his club’s positioning included; Savant OAA uses his actual starting spot and is the better individual grade. They agree best in the outfield. See the model card.
Contract & projection
Club control (RosterResource) · Keystone projected WAR
Minor leagues
MLB Stats API · public box-score data
| SeasonLevel | Level | Team | Age | G | PA / IP | PA / IP ·Line |
|---|---|---|---|---|---|---|
| 2026AAA | AAA | Sacramento River Cats | 28 | 3 | 10 PA | 10 PA · .444/.500/.778 · 1 HR · 10.0% K · 0.0% BB |
| 2026ROK | ROK | ACL Giants | 28 | 5 | 19 PA | 19 PA · .389/.421/.556 · 1 HR · 10.5% K · 5.3% BB |
| 2025AAA | AAA | Sacramento River Cats | 27 | 6 | 27 PA | 27 PA · .296/.296/.481 · 1 HR · 22.2% K · 0.0% BB |
| 2025ROK | ROK | ACL Giants | 27 | 1 | 3 PA | 3 PA · .667/.667/.667 · 0 HR · 0.0% K · 0.0% BB |
ABS challenges · 2026
Baseball Savant