P Koryusai Yamamoto #17
South Bay Arsenal (MAN) AAA
Age: 25 | Bats: R | Throws: R | Morale: Normal    
12/31/2025
BNN Index | AAA | SCORES | STANDINGS | STATS | TEAMS | PLAYERS | TRANSACTIONS | HISTORY
P KORYUSAI YAMAMOTO #17 - AGE: 25 - BATS: R - THROWS: R - MORALE: NORMAL
G GS Rec SV ERA IP HA HR BB K WHIP WAR
53 0 4-2 2 5.72 94.1 103 19 48 97 1.60 -0.5
PITCHING RATINGS (OSA)
Pot. Overall Vs Left Vs Right Pot.
Stuff 55
Movement 20
Control 32
PITCHING RATINGS
Pitch Cur. Pot.
Fastball - 71
Curveball - 66
Changeup - 13
 
 
OTHER PITCHING RATINGS
Velocity 92-94 Mph
Stamina 78
Suggested Role Bullpen
Groundball Percentage 41 %
Hold Runners 56
Defense 52
RUN/BUNT RATINGS
Running Speed: 6
Stealing Ability: 3
Baserunning Inst.: 3
Sacrifice Bunt: 100
Bunt for Hit: 1
   
GAME LOG, LAST 10 GAMES
Date Vs. Result Start IP H R ER BB K Dec
09/04/2026 @ BRO Loss, 0-0 4.0 4 2 2 1 1
09/02/2026 @ BRO Loss, 0-0 0.2 0 0 0 0 1
09/03/2026 @ MIN Loss, 0-0 2.0 0 0 0 0 2
08/29/2026 @ CHI Loss, 0-0 2.1 1 0 0 1 2
08/26/2026 @ PHI Loss, 0-0 2.1 3 3 3 2 2
08/15/2026 @ JOP Loss, 0-0 1.1 2 0 0 0 2
08/12/2026 @ ANT Loss, 0-0 2.0 3 2 2 0 3
08/07/2026 @ AST Loss, 0-0 2.0 0 0 0 2 0
08/05/2026 @ DET Loss, 0-0 0.1 0 0 0 0 1
07/27/2026 @ VAN Loss, 0-0 2.0 1 0 0 0 2
PERSONALITY
Leader Ability:Very High
Loyalty:Normal
Desire f. Win:Low
Greed:Normal
Intelligence:Low
Work Ethic:High
Birthday:03/30/2000
Born in:Shiwa, IWA
Nationality:Japanese
Height:6' 1"
Weight:180 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:-
TRIPLE A 2025 PITCHING STATS
Pitching G GS W L SV ERA IP HA R ER HR BB K CG CG% SHO QS QS%
Overall 53 0 4 2 2 5.72 94.1 103 67 60 19 48 97 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 8 2 50.0 53 13 14.60 9.83 9.25 4.58 5.82 1.60 117 -0.5 .323        
Pitching AB H 2B 3B HR R BB K SF SH HP AVG OBP SLG OPS      
vs. LHB 144 46 9 1 11 30 20 35 1 0 2 .319 .407 .625 1.032      
vs. RHB 230 57 11 1 8 37 28 62 1 2 0 .248 .328 .409 .737      
TRIPLE A 2025 PITCHING SPLITS
Split G GS W L SV ERA IP HA R ER HR BB K  
April 10 0 1 1 1 3.43 21.0 18 12 8 1 11 22  
May 10 0 1 0 0 5.09 17.2 18 10 10 4 8 19  
June 11 0 1 1 1 7.13 17.2 22 17 14 9 9 19  
July 10 0 0 0 0 6.86 19.2 23 15 15 3 12 18  
August 9 0 0 0 0 6.28 14.1 15 10 10 0 5 13  
September 6 0 1 0 0 4.22 10.2 11 5 5 2 4 10  
Last Year 66 0 4 3 3 6.00 108.0 127 77 72 14 69 104  
2 Years Ago 42 0 4 7 25 6.00 42.0 42 29 28 5 28 37  
Career 161 0 12 12 30 5.89 244.1 272 173 160 38 145 238  
Home 3 0 0 0 0 4.15 4.1 3 2 2 2 1 7  
Road 6 0 1 0 1 6.94 11.2 15 9 9 2 8 16  
Grass 51 0 3 2 2 4.94 93.0 94 58 51 16 46 93  
Turf 5 0 1 0 0 12.38 8.0 13 11 11 3 3 8  
Day 17 0 0 0 1 3.67 34.1 33 17 14 3 14 38  
Night 39 0 4 2 1 6.48 66.2 74 52 48 16 35 63  
As Reliever / Substitution 56 0 4 2 2 5.52 101.0 107 69 62 19 49 101  
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+
2020 Beach City - A 20 52 4 5 5 10 3.03 77.1 68 31 26 2 53 111 0 0 1.56 .355 3.38 1.6 148
2021 Beach City - A 21 1 0 1 0 0 0.00 2.0 1 0 0 0 1 3 0 0 1.00 .250 2.48 0.1 999
2021 West Coast - AA 21 36 24 8 10 1 4.36 163.0 141 90 79 19 95 159 1 0 1.45 .278 5.13 2.0 117
2022 West Coast - AA 22 38 11 4 4 2 5.86 101.1 116 77 66 8 70 77 0 0 1.84 .342 5.35 1.0 89
2023 West Coast - AA 23 31 0 2 0 0 3.27 44.0 37 19 16 4 24 50 0 0 1.39 .297 4.13 0.6 154
2023 South Bay - AAA 23 42 0 4 7 25 6.00 42.0 42 29 28 5 28 37 0 0 1.67 .296 5.59 -0.0 86
2024 South Bay - AAA 24 66 0 4 3 3 6.00 108.0 127 77 72 14 69 104 0 0 1.81 .354 5.48 -0.2 83
2025 South Bay - AAA 25 53 0 4 2 2 5.72 94.1 103 67 60 19 48 97 0 0 1.60 .323 5.82 -0.5 87
Total AAA 161 0 12 12 30 5.89 244.1 272 173 160 38 145 238 0 0 1.71 .332 5.63 85.1
Total AA 105 35 14 14 3 4.70 308.1 294 186 161 31 189 286 1 0 1.57 .304 5.06 113.0
Total A 53 4 6 5 10 2.95 79.1 69 31 26 2 54 114 0 0 1.55 .353 3.36 169.0
CAREER POSTSEASON 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+
2025 South Bay - AAA 25 3 0 0 0 0 2.70 6.2 4 2 2 0 1 4 0 0 0.75 .200 0.00 0.0 0
Total AAA 3 0 0 0 0 2.70 6.2 4 2 2 0 1 4 0 0 0.75 .200 3.02 184.3
CAREER FIELDING STATS
Year/Team/League POS G GS PO A DP TC E PCT INN RNG ZR EFF PB RSTA RTO RTO%
2020 Beach City - A P 52 4 1 5 0 8 2 .750 77.1 0.70 -0.4 .878
2021 West Coast - AA P 36 24 7 19 2 26 0 1.000 163.0 1.44 +1.8 1.167
2021 Beach City - A P 1 0 0 0 0 0 0 .000 2.0 0.00 +0.0 .000
2022 West Coast - AA P 38 11 4 16 0 21 1 .952 101.1 1.78 +1.5 1.115
2023 South Bay - AAA P 41 0 6 10 1 17 1 .941 42.0 3.43 -0.1 .941
2023 West Coast - AA P 31 0 0 7 1 7 0 1.000 44.0 1.43 +0.5 1.058
2024 South Bay - AAA P 65 0 1 8 1 10 1 .900 108.0 0.75 +1.1 1.125
2025 South Bay - AAA P 51 0 2 8 1 11 1 .909 94.1 0.95 +0.6 1.052
TOTAL P 315 39 21 73 6 100 6 .940 632.0 1.34 +5.0 1.078
PLAYER HISTORY
01/13/2017 Signed a minor league contract out of Japan with the Ann Arbor Barn Owls organization.
01/01/2018 OSA scouting updated ratings (potential): Stuff: - (9); Movement: - (10); Control: - (8).
01/01/2019 OSA scouting updated ratings (potential): Stuff: - (9); Movement: - (10); Control: - (9).
03/26/2019 Injured (flu), day-to-day for 2 days.
01/01/2020 OSA scouting updated ratings (potential): Stuff: - (9); Movement: - (11); Control: - (9).
09/15/2020 Injured (flu), day-to-day for 1 day.
01/01/2021 OSA scouting updated ratings (potential): Stuff: - (10); Movement: - (11); Control: - (10).
01/01/2022 OSA scouting updated ratings (potential): Stuff: - (7); Movement: - (6); Control: - (7).
01/01/2023 OSA scouting updated ratings (potential): Stuff: - (31); Movement: - (31); Control: - (34).
01/01/2024 OSA scouting updated ratings (potential): Stuff: - (54); Movement: - (31); Control: - (38).
01/01/2025 OSA scouting updated ratings (potential): Stuff: - (55); Movement: - (22); Control: - (34).
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