Players · K · SS · 2026 regular season

Christian Koss

San Francisco Giants National League WestSS

Age: 28
B/T: R/R
Height: 6' 1"
Weight: 185 lb
Number: #50

Born: January 27, 1998 in Riverside, CA, United States
MLB debut: April 1, 2025
Drafted: 2019, round 12
College: UC Irvine

Compare with…vs Trevor Story vs Kyle Isbel vs Pedro Pagés

dbWAR: .7
PA: 221
AVG: .217
OBP: .257
SLG: .305
wRC+: 55

Christian Koss is a shortstop for the San Francisco Giants. In 2026 he hit 4 home runs and knocked in 12 RBIs, notching 44 hits across 221 plate appearances in 67 games. His batting average was .217, 11.2% lower than the league average of .244. He reached base at a .257 clip and slugged .305, for an OPS of .562, 21.8% lower than the league mark of .719 — the second worst on his team, and 431st of 465 among MLB batters with 100+ plate appearances. He averaged 80.8 mph off the bat, hit 26.8% of balls in play at 95 mph or better, barrelled 2.0% of them and made contact on 69.9% of his swings. Adjusted for his ballpark and league, his 55 wRC+ puts his offence 45% below average. That comes to -0.1 dbWAR — -12.1 runs with the bat, +0.3 for the ballpark, +0.7 on the bases, +0.7 on double plays, +2.5 for the position he plays, against replacement level. It includes no fielding: defensive runs are proprietary and are not estimated here, so the figure credits playing a demanding position but not playing it well.

League context

Percentile among qualified batters, 2026 regular season.

wRC+55

wOBA.252

ISO.089

BB%4.1%

WAR-.1

How the WAR is built

Runs above replacement, 2026. These terms sum to -1.1 runs, divided by runs-per-win to give WAR. There is no fielding term.

BattingBallparkBaserunningDouble playsPositionReplacement

WAR by season

Batting Regular season

Standard and advanced, by season. Regular-season games only.

																					Trend
2026	SF	67	221	44	4	12	5	9	59	.217	.257	.305	.089	.286	4.1%	26.7%	.252	-12.1	55	-0.1
2025	SF	63	191	46	3	23	4	9	45	.264	.309	.368	.103	.336	4.7%	23.6%	.299	-2.6	89	0.7

Pitching Regular season

Standard and advanced, by season. Regular-season games only.

																				Trend
2026	SF	2	0	2.0	0	0	0	5	3	0	0	13.50	3.10	2.50	0.0	0.0	323	74	0.0
2025	SF	4	0	4.0	0	0	0	4	0	0	0	0.00	3.14	1.00	0.0	0.0	0	75	0.1

Platoon splits

How he hits left- and right-handed pitching.

Season

Batting by the hand the pitcher throws with, 2026. Counted from play-by-play, so totals can differ from the box-score season line by a plate appearance or two.
Split	PA	AB	H	HR	BB	SO	AVG	OBP	SLG	wOBA	K%
vs LHP	68	63	12	4	2	18	.190	.215	.397	.262	26.5%
vs RHP	153	140	32	0	7	41	.229	.275	.264	.248	26.8%

Season

Opponent batting by the side the hitter bats from, 2026. Counted from play-by-play, so totals can differ from the box-score season line by a plate appearance or two.
Split	PA	AB	H	HR	BB	SO	AVG	OBP	SLG	wOBA	K%
vs LHB	4	4	2	0	0	0	.500	.500	.750	.537	0.0%
vs RHB	6	6	3	0	0	0	.500	.500	.667	.507	0.0%

Spray chart

Where every ball he put in play landed, 2026.

Loading 150 batted balls…

Contact quality

How hard and at what angle he hits it, over 149 tracked batted balls in 2026. Percentiles are against qualified batters.

Barrel rate: 2.0%
Exit velocity: 80.8
Max exit velo: 108.7
Hard hit: 26.8%
Sweet spot: 30.9%
Launch angle: 8.3°

Barrel rate2.0%

Exit velocity80.8 mph

Hard hit rate26.8%

Contact rate69.9%

A barrel is a batted ball whose exit velocity and launch angle have historically produced at least a .500 average and 1.500 slugging — 98 mph within 26–30°, widening to 8–50° by 116 mph. Reconstructed from Statcast's published anchor points, which reproduces them exactly; the interior is within a degree. Sweet spot (8–32°) is an exact definition.

Hot and cold zones

Batting average by pitch location, 2026.

Below averageLeague averageAbove average

Batting average by location of the pitch that ended each plate appearance, catcher's view. The bordered square is the strike zone; the outer band is chase territory. Cells with fewer than 8 at-bats are left grey rather than shown as signal. League average on the same attribution is .243.

Situational hitting

How Christian Koss hits by base state, outs, score and late-game pressure — each read against his own season line.

Split by

By who is on base when he comes up. The season line is repeated as the baseline.
Situation	PA	AB	H	HR	RBI	BB	SO	AVG	OBP	SLG	wOBA
All situations	221	—	—	—	—	—	—	.217	.257	.305	.252
Bases empty	127	119	25	2	2	7	37	.210	.260	.294	.251
Runner on first	51	49	13	2	5	0	15	.265	.280	.429	.307
Runners on	94	84	19	2	10	2	22	.226	.253	.321	.255
RISP	43	35	6	0	5	2	7	.171	.216	.171	.184

Runners on includes runners in scoring position, which is the convention every reference uses. Counted from play-by-play, 2026.

Pitch sequencing

What Christian Koss throws in each count, and what he follows each pitch with. Select any cell for the breakdown.

ShowBatter

Eephus

Select a count to see exactly what Christian Koss throws in it.

Pitch arsenal

What he throws, how hard, how often it misses, and what hitters do with it.

Season


Eephus	100.0%	28	49.0	1,352	25.0%	8.3%	10	—	—

Christian Koss's arsenal by usage. Velocity is average release speed in mph, spin in rpm, and whiff rate is misses per swing — the cleanest single measure of whether a pitch beats hitters. BAA and OPS are what hitters did against each pitch, credited to the one that ended the plate appearance, and are left blank under 15 at-bats.

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Similar players

Nearest 2026 seasons by discipline, contact, power and speed, on rate statistics rather than totals.

Kyle IsbelKC

wRC+: 59
HR: 6
AVG: .224
WAR: -0.4

Very close

Pedro PagésSTL

wRC+: 66
HR: 4
AVG: .217
WAR: 0.1

Tristan GrayMIN

wRC+: 62
HR: 4
AVG: .225
WAR: -0.1

Denzer GuzmanLAA

wRC+: 68
HR: 8
AVG: .219
WAR: -0.0

How these are computed

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.