P Koichi Yamasaki #53
West Coast Defenders (MAN) AA
Age: 21 | Bats: L | Throws: L | Morale: Very Good    
12/31/2025
BNN Index | AA | SCORES | STANDINGS | STATS | TEAMS | PLAYERS | TRANSACTIONS | HISTORY
P KOICHI YAMASAKI #53 - AGE: 21 - BATS: L - THROWS: L - MORALE: VERY GOOD
G GS Rec SV ERA IP HA HR BB K WHIP WAR
32 0 2-1 2 5.18 33.0 34 4 20 30 1.64 0.0
PITCHING RATINGS (OSA)
Pot. Overall Vs Left Vs Right Pot.
Stuff 36
Movement 37
Control 11
PITCHING RATINGS
Pitch Cur. Pot.
Fastball - 49
Slider - 32
Curveball - 39
Changeup - 42
Forkball - 48
OTHER PITCHING RATINGS
Velocity 91-93 Mph
Stamina 53
Suggested Role Starter
Groundball Percentage 61 %
Hold Runners 57
Defense 18
RUN/BUNT RATINGS
Running Speed: 37
Stealing Ability: 6
Baserunning Inst.: 32
Sacrifice Bunt: 33
Bunt for Hit: 5
   
GAME LOG, LAST 10 GAMES
Date Vs. Result Start IP H R ER BB K Dec
08/04/2026 @ FRI Loss, 0-0 1.0 1 1 1 2 0
08/02/2026 LAK Loss, 0-0 2.0 2 0 0 1 3
07/28/2026 @ WIS Loss, 0-0 1.1 1 0 0 0 1 Save
07/27/2026 @ FRI Loss, 0-0 0.2 2 0 0 0 0
07/27/2026 @ BUZ Loss, 0-0 0.0 0 0 0 0 0
07/23/2026 @ TEM Loss, 0-0 1.2 0 0 0 1 2
07/19/2026 @ JAC Loss, 0-0 1.0 3 3 3 1 0
07/16/2026 @ FAI Loss, 0-0 2.0 0 0 0 2 4 Win
07/14/2026 @ PAC Loss, 0-0 2.0 1 0 0 1 2
07/09/2026 @ BER Loss, 0-0 0.0 2 2 2 0 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:185 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:2 Years
Arbitration Eligibility:Not yet eligible
Option Years:3 option years left
Contract Extension: -
Drafted:2023, 11th Pick in Round 3
DOUBLE A 2025 PITCHING STATS
Pitching G GS W L SV ERA IP HA R ER HR BB K CG CG% SHO QS QS%
Overall 32 0 2 1 2 5.18 33.0 34 19 19 4 20 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 14 3 40.0 32 5 14.73 9.27 8.18 5.45 4.86 1.64 104 0.0 .319        
Pitching AB H 2B 3B HR R BB K SF SH HP AVG OBP SLG OPS      
vs. LHB 42 13 0 0 1 5 4 9 0 0 0 .310 .370 .381 .751      
vs. RHB 86 21 2 0 3 14 16 21 0 0 0 .244 .363 .372 .735      
DOUBLE A 2025 PITCHING SPLITS
Split G GS W L SV ERA IP HA R ER HR BB K  
April 5 0 0 0 0 4.50 2.0 4 1 1 1 0 2  
May 8 0 0 0 0 2.35 7.2 9 2 2 1 4 6  
June 7 0 1 0 1 4.82 9.1 6 5 5 0 4 10  
July 10 0 1 1 1 8.18 11.0 12 10 10 2 9 9  
August 2 0 0 0 0 3.00 3.0 3 1 1 0 3 3  
Last Year 35 35 12 12 0 6.01 185.2 237 145 124 30 101 157  
Career 67 35 14 13 2 5.89 218.2 271 164 143 34 121 187  
Home 1 0 0 0 0 0.00 2.0 2 0 0 0 1 3  
Road 2 0 0 0 0 4.50 2.0 2 1 1 0 1 1  
Grass 32 0 2 1 2 5.18 33.0 34 19 19 4 20 30  
Day 8 0 0 0 0 6.00 9.0 9 6 6 1 6 10  
Night 24 0 2 1 2 4.88 24.0 25 13 13 3 14 20  
As Reliever / Substitution 32 0 2 1 2 5.18 33.0 34 19 19 4 20 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
Total AA 67 35 14 13 2 5.89 218.2 271 164 143 34 121 187 0 0 1.79 .351 5.62 81.8
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
TOTAL P 96 63 24 46 1 76 6 .921 408.1 1.54 +1.6 .962
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.
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