Miami Marlins · Pitcher · #71

William Kempner

Age 256' 0" · 222lbBats R · Throws RDebut 2026From San Jose

ERA

2.92

W-L

1-0

WHIP

0.97

WAR

0.1

FIP

3.33

League Percentile

2026 season · percentile vs 290 relievers with 20+ IP

the entire league54 relief pitchers290

ERA

2.92

WHIP

0.97

Strikeouts

K/9

10.22

Wins

Bottom of leagueAverage (50)Top of league

⚠ Below the 20 IP threshold. Percentiles are for reference only.

relief pitchers · by ERA

Top 23%

William Kempner's ERA (2.92) ranks above average among 290 relievers with 20+ IP. The number on each bar is a percentile (higher is better); use the tabs to change the comparison pool.

PITCHING

Season · Career

Category	Games	ERA	Wins	Losses	Saves	Innings	Strikeouts	Walks	WHIP
2026 Season	9	2.92	1	0	0	12.1	14	4	0.97
Career	9	2.92	1	0	0	12.1	14	4	0.97

Hover over a stat for its definition.

ARSENAL

Pitch arsenal · 2026 usage and average velocity

Four-Seam48.2%avg 154 km/h

Sweeper22.1%avg 131 km/h

Sinker14.6%avg 151 km/h

Cutter12.6%avg 140 km/h

Changeup2.5%avg 140 km/h

ADVANCED

Advanced metrics · 2026 season

BABIP

.241

K/9

10.22

BB/9

2.92

HR/9

0.73

Quality starts

Whiff%

34.1%

GAME LOG

Last 9 games · includes team result

Date	Opp	Innings	Hits	ER	Walks	Strikeouts	Team
07.11	vs CLE	2.0	3	2	0	3	L
07.09	vs SEA	0.1	2	2	2	0	W
07.03	@ ATH	1.0	0	0	0	1	W
06.15	@ PHI	2.1	0	0	0	2	L
06.10	vs AZ	2.0	0	0	2	3	W
06.05	vs TB	1.1	1	0	0	1	L
05.31	@ NYM	1.1	2	0	0	3	L
05.30	@ NYM	1.0	0	0	0	0	L
05.05	vs BAL	1.0	0	0	0	1	L

SPLITS

Situational splits (2026)

Home

Opp AVG.240

IP6.2

WHIP1.50

Away

Opp AVG.105

IP5.2

WHIP0.35

vs LHP

Opp AVG.167

IP8.2

K12

WHIP0.81

vs RHP

Opp AVG.214

IP3.2

WHIP1.36

RISP

Opp AVG.111

IP2.2

WHIP0.38

YEAR BY YEAR

Year-by-year · Career trends

Year	Team	Games	ERA	Wins	Losses	Saves	Innings	Strikeouts	Walks	WHIP
2026	MIA	9	2.92	1	0	0	12.1	14	4	0.97