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William Kempner

RP · Miami Marlins · #71

Bats/ThrowsR/R

Height6' 0"

Weight222 lbs

BirthplaceSan Jose, CA

MLB Debut2025

🪪Bio

Bats/ThrowsR/R

Height6' 0"

Weight222 lbs

BirthplaceSan Jose, CA

MLB Debut2025

📊Season Stats (2026)

ERA2.92

W-L1-0

IP12.1

K14

WHIP0.97

SV0

Full Stat Line

GS0

QS0

HLD0

ER4

HR1

BB4

K/910.22

WAR0.18

🤚Career Splits by Handedness

vs Left-Handed Batters

AVG.238

OBP.333

SLG.476

OPS.810

24 PA · Ranks #429 of 612 qualified pitchers

Career totals from real plate-appearance data — lower OPS allowed is better for a pitcher.

⚔️This Season vs. Each Opponent

Opponent	ERA	IP	K	BB	Opp AVG
vs. NYM	0.00	2.1	3	0	.222
vs. PHI	0.00	2.1	2	0	.000
vs. ARI	0.00	2.0	3	2	.000
vs. CLE	9.00	2.0	3	0	.375
vs. TB	0.00	1.1	1	0	.200
vs. BAL	0.00	1.0	1	0	.000
vs. OAK	0.00	1.0	1	0	.000
vs. SEA	54.00	0.1	0	2	.667

🏟️This Season at Each Ballpark

Ballpark	ERA	IP	K	BB	Opp AVG
Total	2.92	12.1	14	4	.182
Marlins Park	5.40	6.2	8	4	.240
Citi Field	0.00	2.1	3	0	.222
Citizens Bank Park	0.00	2.1	2	0	.000

📅By Month & Recent Form

Split	ERA	IP	K	BB	Opp AVG
Last 7 Days	9.00	2.0	3	0	.375
Last 15 Days	9.00	2.0	3	0	.375
Last 30 Days	9.00	2.0	3	0	.375
May	0.00	3.1	4	0	.167
June	0.00	5.2	6	2	.056
July	10.80	3.1	4	2	.357

🎯Pitch Arsenal (2026)

Type	Pitches	Usage%	Zone%	Chase%	Whiff%	BA	wOBA	xwOBA
4-Seam Fastball	91	48.9%	41.8%	38.5%	35.9%	.278	.445	.430
Sweeper	44	23.7%	40.9%	44.0%	40.0%	.154	.278	.301
Sinker	25	13.4%	32.0%	50.0%	12.5%	.000	.000	.250
Cutter	22	11.8%	54.5%	11.1%	44.4%	.000	.000	.139
Changeup	4	2.1%	25.0%	0.0%	0.0%	—	—	—

🌀Pitch Movement (2026)

Type	#	Velo	Spin	IVB	H-Break	Ext
4-Seam Fastball	26	95.4	2,381	+12.9"	+1.4"	6.1
Sweeper	14	82.1	2,904	+6.2"	-1.4"	6.1
Sinker	10	94.1	2,225	+4.3"	+1.7"	6.1

IVB = induced vertical break (gravity removed) · H-Break = horizontal movement · Ext = release extension in feet.

📋Recent Game Log

	Date	Opp	Score	IP	H	ER	BB	K	ERA	PC	Dec
L	Saturday, July 11, 2026	CLE	4-1	2.0	3	2	0	3	2.92	42	—
L	Monday, June 15, 2026	PHI	0-7	2.1	0	0	0	2	0.00	33	—
W	Wednesday, June 10, 2026	ARI	0-8	2.0	0	0	2	3	0.00	36	W
L	Friday, June 5, 2026	TB	6-0	1.1	1	0	0	1	0.00	13	—
L	Sunday, May 31, 2026	NYM	1-10	1.1	2	0	0	3	0.00	28	—
L	Saturday, May 30, 2026	NYM	1-6	1.0	0	0	0	0	0.00	12	—
L	Tuesday, May 5, 2026	BAL	9-7	1.0	0	0	0	1	0.00	8	—

👥Team — Miami Marlins

Player	Pos	Key Stat
Kyle Stowers	1B	.244 AVG
Xavier Edwards	2B	.282 AVG
Deyvison De Los Santos	3B	.267 AVG
Leo Jimenez	3B	.199 AVG
Graham Pauley	3B	.209 AVG
Javier Sanoja	3B	13.50 ERA
Logan Driscoll	C	—
Joe Mack	C	.238 AVG
Brian Navarreto	C	.130 AVG
Jakob Marsee	CF	.224 AVG
Agustin Ramirez	DH	.219 AVG
Heriberto Hernandez	LF	.225 AVG
Anthony Bender	Relief Pitcher	2.62 ERA
Andrew Nardi	Relief Pitcher	5.16 ERA
Owen Caissie	RF	.220 AVG
Griffin Conine	RF	.255 AVG
Esteury Ruiz	RF	.232 AVG
Austin Slater	Right Fielder	0.00 ERA
Bradley Blalock	RP	3.00 ERA
Josh Ekness	RP	4.37 ERA
Pete Fairbanks	RP	6.02 ERA
Calvin Faucher	RP	3.67 ERA
Dax Fulton	RP	3.32 ERA
Cade Gibson	RP	5.32 ERA
Wikelman Gonzalez	RP	2.66 ERA
John King	RP	3.99 ERA
Patrick Monteverde	RP	9.00 ERA
Michael Petersen	RP	3.24 ERA
Tyler Phillips	RP	3.51 ERA
Jack Ralston	RP	3.86 ERA
Victor Vodnik	RP	5.01 ERA
Tyler Zuber	RP	4.93 ERA
Sandy Alcantara	SP	3.78 ERA
Ryan Gusto	SP	4.23 ERA
Janson Junk	SP	4.54 ERA
Max Meyer	SP	2.68 ERA
Eury Perez	SP	3.94 ERA
Otto Lopez	SS	.303 AVG
Jared Serna	SS	.375 AVG
Chris Paddack	Starting Pitcher	6.79 ERA

See the Full Analysis

Key Suspects, player props, DFS rankings, and matchup intelligence for William Kempner and every MLB game — available in the BlowOutAlert workspace.

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