Dynasty
Nastiest GIFs
The List
Dynasty
Nastiest GIFs
The List

William Kempner

#71 - Relief Pitcher

Miami Marlins

Bats / Throws Right / Right
Date of Birth 6/18/2001 (25)
Height, Weight 6'0", 222 lb
Hometown San Jose, CA

Season Stats

MLB Rank MLB Average
Sv IP ERA WHIP K% BB%
0 12.1 2.92 0.97 28.0% 8.0%
- 2
Sv
- 33.0
IP
- 4.33
ERA
- 1.37
WHIP
- 22.3%
K%
- 10.0%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
95.5 15.6% 33.7% 53.8% 5.0% 4.76 4.01
117th 94.4
FB MPH
- 12.1%
SwStr%
- 28.4%
CSW%
- 50.7%
Str-ICR
- 4.6%
MTK%
- 4.93
PLV
- 3.55
PLA
Holds List
Rank
83rd

Articles

7/12/2026Fantasy Baseball Relief Pitcher Roundup: 7/11Rick Graham

7/10/2026Fantasy Baseball Relief Pitcher Roundup: 7/9Rick Graham

6/16/2026Fantasy Baseball Relief Pitcher Roundup: 6/15Rick Graham

6/16/2026Relief Pitcher Streamer Rankings Fantasy Baseball: 6/16Rick Graham

6/15/2026Relief Pitcher Streamer Rankings Fantasy Baseball: 6/15Rick Graham

See More Articles
PL Pro logo Get PL Pro

Exclusive Access to:

Weekly Player Rater | Live Draft Assistant Tool
2026 Season Projections | Ad-Free Website

book icon Stats Glossary

William Kempner Overview

Year Team G GS IP W-L Sv Hld ERA WHIP xERA FIP xFIP PLA K% BB% H/9 HR/9 BABIP HR/FB% LOB% ICR% GB% SwStr% CSW% IPR% PLV
No MLB experience

William Kempner Repertoire

2026 All
Hide MLB Percentile | Hide MLB Average

William Kempner Game Log

William Kempner Standard

Year Team G GS IP W-L QS Sv Hld P Strikes Balls TBF H 1B 2B 3B HR K BB HB WP
No MLB experience

William Kempner Advanced

Year Team K% BB% AVG SLG OPS wOBA BABIP BACON xAVG xwOBA xBABIP xwoBACON EV FB EV LA xERA
No MLB experience

William Kempner Pitch › Mix

Year Team FF% (MPH) SI% (MPH) FC% (MPH) SL% (MPH) ST% (MPH) CB% (MPH) CH% (MPH) FS% (MPH) KN% (MPH) Fastball% Secondary%
No MLB experience

William Kempner Pitch › Results

Year Team FF CSW% SI CSW% FC CSW% SL CSW% ST CSW% CB CSW% CH CSW% FS CSW% KN CSW% Fastball CSW% Secondary CSW%
No MLB experience

William Kempner Batted Ball › Contact

Year Team GB% LD% FB% PU% SS% Pull% Cent% Oppo% Foul Str% PC% Fl&B% Solid% Brl% ICR%
No MLB experience

William Kempner Batted Ball › Outcomes

Year Team AVG wOBA BABIP BACON xAVG xwOBA xBABIP xwoBACON EV FB EV LA HR/FB ICR% IPA%
No MLB experience

William Kempner Approach › Plate Discipline

Year Team Zone% Str% Swing% O-Sw% Whiff% Foul Str% Con% Z-Con% O-Con% CS% SwStr% CSW% BIP% PLUS% IPR% Str-ICR
No MLB experience

William Kempner Approach › Locations

Year Team Zone% aLoc% x-mLoc% gLoc% hiLoc% y-mLoc% loLoc% iLoc% oLoc% mmLoc%
No MLB experience

William Kempner Approach › Counts

Year Team Early% Behind% 2-Str% Early BIP% F-Str% TF-Str% ECS% 2-Str O-Sw% PAR%
No MLB experience

William Kempner PLV

Year Team P PLV QP% AP% BP% Q-BP% MTK% HP HL PLA
No MLB experience
Get Premium