P Koichi Yamasaki #53
West Coast Defenders (MAN) AA
Age: 22 | Bats: L | Throws: L | Morale: Very Unhappy    
12/31/2026
BNN Index | AA | SCORES | STANDINGS | STATS | TEAMS | PLAYERS | TRANSACTIONS | HISTORY
P KOICHI YAMASAKI #53 - AGE: 22 - BATS: L - THROWS: L - MORALE: VERY UNHAPPY
G GS Rec SV ERA IP HA HR BB K WHIP WAR
38 0 1-0 2 3.31 35.1 35 2 23 30 1.64 0.0
PITCHING RATINGS (OSA)
Pot. Overall Vs Left Vs Right Pot.
Stuff 32
Movement 41
Control 4
PITCHING RATINGS
Pitch Cur. Pot.
Fastball - 47
Slider - 32
Curveball - 39
Changeup - 33
Forkball - 47
OTHER PITCHING RATINGS
Velocity 91-93 Mph
Stamina 56
Suggested Role Starter
Groundball Percentage 60 %
Hold Runners 57
Defense 18
RUN/BUNT RATINGS
Running Speed: 36
Stealing Ability: 6
Baserunning Inst.: 31
Sacrifice Bunt: 34
Bunt for Hit: 5
   
GAME LOG, LAST 10 GAMES
Date Vs. Result Start IP H R ER BB K Dec
08/22/2027 @ BOI Loss, 0-0 2.0 2 1 1 2 4
08/21/2027 @ CAR Loss, 0-0 3.0 3 0 0 1 2 Save
08/11/2027 @ SAN Loss, 0-0 3.2 3 0 0 0 3
08/04/2027 @ PHO Loss, 0-0 0.1 0 0 0 0 0
07/11/2027 @ RIC Loss, 0-0 2.0 2 1 1 2 1
07/05/2027 @ CIN Loss, 0-0 2.0 2 0 0 0 0
06/17/2027 @ PHO Loss, 0-0 2.2 3 2 2 4 2
06/11/2027 @ BOI Loss, 0-0 2.0 2 0 0 1 0
06/03/2027 @ TYL Loss, 0-0 2.0 2 1 1 1 0
05/27/2027 @ LON Loss, 0-0 1.2 1 3 2 1 0
PERSONALITY
Leader Ability:High
Loyalty:Very High
Desire f. Win:Low
Greed:Normal
Intelligence:Normal
Work Ethic:Low
Birthday:04/06/2004
Born in:Unknown
Nationality:Japanese
Height:6' 0"
Weight:190 lbs
Local Popularity:Insignificant
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:3 Years
Arbitration Eligibility:Not yet eligible
Option Years:3 option years left
Contract Extension: -
Drafted:2023, 11th Pick in Round 3
DOUBLE A 2026 PITCHING STATS
Pitching G GS W L SV ERA IP HA R ER HR BB K CG CG% SHO QS QS%
Overall 38 0 1 0 2 3.31 35.1 35 14 13 2 23 30 0 0.0 0 0 0.0
Pitching SVO BS SV% RA GF R/9 H/9 K/9 BB/9 FIP WHIP FIP- WAR BABIP        
Overall 12 1 66.7 38 6 15.54 8.92 7.64 5.86 4.99 1.64 106 0.0 .324        
Pitching AB H 2B 3B HR R BB K SF SH HP AVG OBP SLG OPS      
vs. LHB 61 20 3 1 1 7 9 17 1 0 1 .328 .417 .459 .876      
vs. RHB 71 15 1 0 1 7 14 13 1 0 2 .211 .352 .268 .620      
DOUBLE A 2026 PITCHING SPLITS
Split G GS W L SV ERA IP HA R ER HR BB K  
April 3 0 0 0 1 0.00 4.0 1 0 0 0 2 7  
May 6 0 0 0 0 3.86 4.2 4 3 2 1 3 4  
June 7 0 1 0 0 3.38 8.0 8 3 3 0 6 3  
July 10 0 0 0 0 4.76 5.2 8 3 3 1 6 3  
August 9 0 0 0 1 3.48 10.1 12 4 4 0 3 11  
September 3 0 0 0 0 3.38 2.2 2 1 1 0 3 2  
Last Year 32 0 2 1 2 5.18 33.0 34 19 19 4 20 30  
2 Years Ago 35 35 12 12 0 6.01 185.2 237 145 124 30 101 157  
Career 105 35 15 13 4 5.53 254.0 306 178 156 36 144 217  
Grass 38 0 1 0 2 3.31 35.1 35 14 13 2 23 30  
Day 11 0 0 0 1 2.31 11.2 8 3 3 1 7 10  
Night 27 0 1 0 1 3.80 23.2 27 11 10 1 16 20  
As Reliever / Substitution 38 0 1 0 2 3.31 35.1 35 14 13 2 23 30  
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 Yomiuri - COL 18 12 12 5 3 0 4.42 73.1 67 42 36 6 23 80 0 0 1.23 .303 3.74 2.3 123
2023 Yomiuri - COL 19 16 16 8 4 0 3.06 97.0 81 36 33 12 32 114 0 0 1.16 .286 3.96 2.6 169
2023 Beach City - A 19 9 0 3 0 0 4.66 19.1 17 10 10 3 10 26 0 0 1.40 .326 4.67 0.1 99
2024 West Coast - AA 20 35 35 12 12 0 6.01 185.2 237 145 124 30 101 157 0 0 1.82 .356 5.75 0.7 80
2025 West Coast - AA 21 32 0 2 1 2 5.18 33.0 34 19 19 4 20 30 0 0 1.64 .319 4.86 0.0 90
2026 West Coast - AA 22 38 0 1 0 2 3.31 35.1 35 14 13 2 23 30 0 0 1.64 .324 4.99 0.0 142
Total AA 105 35 15 13 4 5.53 254.0 306 178 156 36 144 217 0 0 1.77 .347 5.53 90.2
Total A 9 0 3 0 0 4.66 19.1 17 10 10 3 10 26 0 0 1.40 .326 4.67 99.5
Total Pro Feeder 28 28 13 7 0 3.65 170.1 148 78 69 18 55 194 0 0 1.19 .294 3.86 149.2
CAREER FIELDING STATS
Year/Team/League POS G GS PO A DP TC E PCT INN RNG ZR EFF PB RSTA RTO RTO%
2022 Yomiuri - COL P 12 12 1 4 0 6 1 .833 73.1 0.61 -0.2 .721
2023 Beach City - A P 9 0 1 4 0 5 0 1.000 19.1 2.33 -0.2 .895
2023 Yomiuri - COL P 16 16 5 17 1 24 2 .917 97.0 2.04 +1.2 1.066
2024 West Coast - AA P 35 35 13 21 0 37 3 .919 185.2 1.65 +0.6 .962
2025 West Coast - AA P 24 0 4 0 0 4 0 1.000 33.0 1.09 +0.2 1.052
2026 West Coast - AA P 28 0 1 6 1 7 0 1.000 35.1 1.78 +0.2 1.059
TOTAL P 124 63 25 52 2 83 6 .928 443.2 1.56 +1.8 .969
PLAYER HISTORY
06/07/2022 Joined the Yomiuri Giants.
08/09/2022 Injured (sore elbow), day-to-day for 4 days.
01/01/2023 OSA scouting updated ratings (potential): Stuff: - (50); Movement: - (43); Control: - (46).
05/18/2023 Was selected to the 2023 NIPPON BASEBALL LEAGUE All-Star Game.
06/02/2023 Injured (wrist soreness), day-to-day for 6 days.
06/07/2023 Drafted in the 2023 first-year player draft (Round 3, Pick 11, 66th overall pick) by the Manhattan Beach Patriots.
06/27/2023 Released by the Yomiuri Giants.
06/27/2023 Signed a minor league contract with the Manhattan Beach Patriots organization with a signing bonus of $320,000.
01/01/2024 OSA scouting updated ratings (potential): Stuff: - (40); Movement: - (39); Control: - (49).
09/18/2024 Injured (tender shoulder), day-to-day for 5 days.
01/01/2025 OSA scouting updated ratings (potential): Stuff: - (23); Movement: - (39); Control: - (30).
06/17/2025 Injured (shoulder inflammation), out for 3-4 months.
09/14/2025 Suffered setback in recovery from injury, will miss another 2 weeks.
09/15/2025 Suffered setback in recovery from injury, will miss another 2 weeks.
01/01/2026 OSA scouting updated ratings (potential): Stuff: - (34); Movement: - (37); Control: - (10).
09/18/2026 Injured (torn rotator cuff), out for 8-9 months.
Tuesday, March 15th, 2016 - OOTP Baseball 16.11 Build 43