P William Kempner #29
Sacramento River Cats (SF) PCL
Age: 25 | Bats: R | Throws: R | Morale: Very Unhappy
01/11/2027
 OA: 40 POT: 40
BNN Index | PCL | SCORES | STANDINGS | STATS | TEAMS | PLAYERS | TRANSACTIONS | HISTORY
P WILLIAM KEMPNER #29 - AGE: 25 - BATS: R - THROWS: R - MORALE: VERY UNHAPPY
G GS Rec SV ERA IP HA HR BB K WHIP WAR
0 0 0-0 0 0.00 0.0 0 0 0 0 0.00 0.0
PITCHING RATINGS (OSA)
Overall Pot. Overall Vs Left Vs Right Pot.
Stuff 45 40 45 50
Movement 50 45 55 50
Control 40 40 45 45
PITCHING RATINGS
Pitch Cur. Pot.
Slider 50 60
Changeup 45 50
Sinker 50 55
 
 
OTHER PITCHING RATINGS
Velocity 97-99 Mph
Stamina 35
Suggested Role BP/Emergency SP
Type Neutral
Hold Runners 45
Defense 50
RUN/BUNT RATINGS
Running Speed: 25
Stealing Ability: 20
Baserunning Inst.: 30
Sacrifice Bunt: 75
Bunt for Hit: 30
   
GAME LOG, LAST 10 GAMES
Date Vs. Result Start IP H R ER BB K Dec
09/23/2026 POR Loss, 8-12 1.2 2 3 3 3 3
09/20/2026 POR Loss, 7-11 3.2 5 1 1 1 2
09/16/2026 @ AKR Win, 10-7 4.1 1 0 0 1 4
09/13/2026 @ AKR Loss, 4-6 1.2 3 3 3 1 3 Loss
08/29/2026 HAR Win, 3-0 0.2 1 0 0 0 1 Save
08/28/2026 HAR Loss, 2-3 1.0 0 0 0 1 2
08/26/2026 HAR Win, 1-0 0.2 0 0 0 0 0
08/22/2026 @ ALT Loss, 4-6 3.0 3 0 0 2 5
08/21/2026 @ ALT Win, 6-5 1.0 1 1 1 1 3
08/16/2026 REA Loss, 4-5 2.0 0 0 0 3 3
PERSONALITY
Member of the rank and file.
Birthday:06/18/2001
Born in:San Jose, CA
Nationality:American
Height:6' 0"
Weight:220 lbs
Local Popularity:Unknown
National Pop.:Unknown
STATUS
Contract:Minor League Contract
Salary:-
Signed Through:-
Major Service:None, None
Service This Yr:None
40-Man Service:None, None
Pro Service:5 Years
Arbitration Eligibility:Not yet eligible
Option Years:3 option years left
Contract Extension: -
Drafted:-
EASTERN LEAGUE 2026 PITCHING STATS
Pitching G GS W L SV ERA IP HA R ER HR BB K CG CG% SHO QS QS%
Overall 48 0 2 1 2 4.02 80.2 67 36 36 11 47 87 0 0.0 0 0 0.0
Pitching SVO BS SV% RA GF BR/9 H/9 K/9 BB/9 FIP WHIP FIP- WAR BABIP        
Overall 4 1 66.7 48 12 13.50 7.48 9.71 5.24 4.52 1.41 103 0.2 .283        
Pitching AB H 2B 3B HR R BB K SF SH HP AVG OBP SLG OPS      
vs. LHB 157 33 4 0 6 22 24 47 1 0 4 .210 .328 .350 .678      
vs. RHB 138 34 10 0 5 14 23 40 0 2 3 .246 .366 .428 .793      
EASTERN LEAGUE 2026 PITCHING SPLITS
Split G GS W L SV ERA IP HA R ER HR BB K  
April 4 0 0 0 0 6.75 2.2 2 2 2 0 4 2  
May 12 0 1 0 0 3.22 22.1 18 8 8 1 10 20  
June 8 0 1 0 0 7.53 14.1 16 12 12 4 10 14  
July 12 0 0 0 1 1.62 16.2 10 3 3 0 8 15  
August 8 0 0 0 1 2.70 13.1 10 4 4 2 9 24  
September 4 0 0 1 0 5.56 11.1 11 7 7 4 6 12  
Last Year 48 0 2 1 2 4.02 80.2 67 36 36 11 47 87  
2 Years Ago 35 0 4 3 5 3.83 51.2 42 25 22 8 25 55  
Career 84 0 6 4 7 3.96 134.0 112 62 59 19 74 144  
Home 21 0 1 0 1 3.08 38.0 29 13 13 5 26 36  
Road 27 0 1 1 1 4.85 42.2 38 23 23 6 21 51  
Grass 48 0 2 1 2 4.02 80.2 67 36 36 11 47 87  
Day 10 0 1 1 1 2.73 26.1 22 8 8 2 13 23  
Night 38 0 1 0 1 4.64 54.1 45 28 28 9 34 64  
As Reliever / Substitution 48 0 2 1 2 4.02 80.2 67 36 36 11 47 87  
NORTHWEST LEAGUE 2026 PITCHING STATS
Pitching G GS W L SV ERA IP HA R ER HR BB K CG CG% SHO QS QS%
Overall 2 1 0 0 1 3.60 5.0 4 2 2 1 3 9 0 0.0 0 0 0.0
Pitching SVO BS SV% RA GF BR/9 H/9 K/9 BB/9 FIP WHIP FIP- WAR BABIP        
Overall 1 0 100.0 1 1 14.40 7.20 16.20 5.40 4.28 1.40 107 0.0 .333        
Pitching AB H 2B 3B HR R BB K SF SH HP AVG OBP SLG OPS      
vs. LHB 7 2 0 0 0 0 2 3 0 0 0 .286 .444 .286 .730      
vs. RHB 12 2 0 0 1 2 1 6 0 0 1 .167 .286 .417 .702      
NORTHWEST LEAGUE 2026 PITCHING SPLITS
Split G GS W L SV ERA IP HA R ER HR BB K  
April 2 1 0 0 1 3.60 5.0 4 2 2 1 3 9  
Last Year 2 1 0 0 1 3.60 5.0 4 2 2 1 3 9  
Career 25 1 3 2 1 3.00 39.0 32 17 13 6 16 56  
Home 2 1 0 0 1 3.60 5.0 4 2 2 1 3 9  
Grass 2 1 0 0 1 3.60 5.0 4 2 2 1 3 9  
Day 1 1 0 0 0 4.91 3.2 2 2 2 1 3 5  
Night 1 0 0 0 1 0.00 1.1 2 0 0 0 0 4  
As Starter 1 1 0 0 0 4.91 3.2 2 2 2 1 3 5  
As Reliever / Substitution 1 0 0 0 1 0.00 1.1 2 0 0 0 0 4  
CAREER PITCHING STATS
Year/Team/League Age G GS W L SV ERA IP HA R ER HR BB K CG SHO WHIP BABIP FIP WAR ERA+
CAREER MINOR LEAGUE PITCHING STATS
Year/Team/League Age G GS W L SV ERA IP HA R ER HR BB K CG SHO WHIP BABIP FIP WAR ERA+
2022 Total - R 20 2 0 1 0 0 2.70 3.1 4 1 1 0 2 5 0 0 1.80 .571 2.00 0.1 148
2022 San Jose - A 20 3 2 0 0 0 6.35 5.2 6 4 4 1 4 6 0 0 1.76 .333 6.55 -0.1 62
2023 San Jose - A 21 14 5 1 3 1 4.67 27.0 21 18 14 0 15 29 0 0 1.33 .284 3.27 0.5 85
2023 Eugene - A+ 21 23 0 3 2 0 2.91 34.0 28 15 11 5 13 47 0 0 1.21 .311 3.94 0.2 137
2023 Total - A+ 21 37 5 4 5 1 3.69 61.0 49 33 25 5 28 76 0 0 1.26 .297 3.64 0.7 108
2023 Richmond - AA 21 1 0 0 0 0 5.40 1.2 3 1 1 0 2 2 0 0 3.00 .500 4.40 -0.0 74
2025 Richmond - AA 23 35 0 4 3 5 3.83 51.2 42 25 22 8 25 55 0 0 1.30 .264 3.90 0.5 111
2026 Eugene - A+ 24 2 1 0 0 1 3.60 5.0 4 2 2 1 3 9 0 0 1.40 .333 4.28 0.0 111
2026 Richmond - AA 24 48 0 2 1 2 4.02 80.2 67 36 36 11 47 87 0 0 1.41 .283 4.52 0.2 109
Total EL 84 0 6 4 7 3.96 134.0 112 62 59 19 74 144 0 0 1.39 .279 4.28 109.4
Total NWL 25 1 3 2 1 3.00 39.0 32 17 13 6 16 56 0 0 1.23 .313 3.98 133.4
Total CAL 17 7 1 3 1 4.96 32.2 27 22 18 1 19 35 0 0 1.41 .292 3.84 79.7
Total ACL 2 0 1 0 0 2.70 3.1 4 1 1 0 2 5 0 0 1.80 .571 2.00 148.1
CAREER FIELDING STATS
Year/Team/League POS G GS PO A DP TC E PCT INN RNG ZR EFF PB RSTA RTO RTO%
2025 Richmond - AA P 35 0 0 3 0 3 0 1.000 51.2 0.52 -0.0 .969
2026 Richmond - AA P 48 0 1 2 0 3 0 1.000 80.2 0.33 +0.4 .944
2026 Eugene - A+ P 2 1 0 0 0 0 0 .000 5.0 0.00 -0.1 .000
TOTAL P 85 1 1 5 0 6 0 1.000 137.1 0.39 +0.3 .959
PLAYER HISTORY
07/17/2022 Drafted by the San Francisco Giants in the 3rd round of the 2022 MLB June Amateur Draft from Gonzaga University (Spokane, WA).
04/05/2024 Richmond Flying Squirrels placed RHP William Kempner on the 7-day injured list. [Auto]
08/09/2024 Richmond Flying Squirrels transferred RHP William Kempner from the 7-day injured list to the 60-day injured list. [Auto]
01/01/2025 OSA scouting updated ratings (potential): Stuff: 45 (50); Movement: 50 (50); Control: 45 (50).
01/01/2025 OSA scouting updated ratings (potential): Stuff: 45 (50); Movement: 50 (50); Control: 45 (50).
01/01/2026 OSA scouting updated ratings (potential): Stuff: 45 (50); Movement: 50 (50); Control: 45 (45).
01/01/2026 OSA scouting updated ratings (potential): Stuff: 45 (50); Movement: 50 (50); Control: 45 (45).
01/01/2027 OSA scouting updated ratings (potential): Stuff: 45 (50); Movement: 50 (50); Control: 40 (45).
01/01/2027 OSA scouting updated ratings (potential): Stuff: 45 (50); Movement: 50 (50); Control: 40 (45).
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