P Seiichi Yamaguchi #17
Newport Unicorns (BOS) A-
Age: 21 | Bats: L | Throws: L | Morale: Angry
08/12/2026
 OA: 20 POT: 35
BNN Index | A- | SCORES | STANDINGS | STATS | TEAMS | PLAYERS | TRANSACTIONS | HISTORY
P SEIICHI YAMAGUCHI #17 - AGE: 21 - BATS: L - THROWS: L - MORALE: ANGRY
G GS Rec SV ERA IP HA HR BB K WHIP WAR
39 0 1-4 1 9.00 60.0 89 17 20 23 1.82 -1.1
PITCHING RATINGS (OSA)
Overall Pot. Overall Vs Left Vs Right Pot.
Stuff 30 30 30 40
Movement 20 20 20 45
Control 30 30 30 60
PITCHING RATINGS
Pitch Cur. Pot.
Fastball 35 40
Curveball 30 45
Changeup 20 45
Forkball 30 45
 
OTHER PITCHING RATINGS
Velocity 90-92 Mph
Stamina 30
Suggested Role Bullpen
Type Flyball Pitcher
Hold Runners 70
Defense 40
RUN/BUNT RATINGS
Running Speed: 45
Stealing Ability: 20
Baserunning Inst.: 35
Sacrifice Bunt: 65
Bunt for Hit: 25
   
GAME LOG, LAST 10 GAMES
Date Vs. Result Start IP H R ER BB K Dec
08/10/2026 @ SJ Win, 15-14 3.0 4 1 1 1 1 Win
08/07/2026 OTA Loss, 3-5 0.1 0 0 0 0 0
08/04/2026 MED Loss, 3-14 2.0 3 2 2 1 3
07/31/2026 @ SABA Loss, 3-5 2.1 0 0 0 0 0
07/27/2026 @ TAC Loss, 3-6 3.0 3 1 1 1 3
07/21/2026 LR Loss, 8-11 2.0 1 0 0 0 1
07/19/2026 @ GRE Loss, 4-6 3.0 3 2 2 1 0 Loss
07/17/2026 @ AUR Loss, 4-8 1.0 3 4 4 0 0
07/15/2026 @ AUR Loss, 2-8 0.2 0 0 0 0 0
07/12/2026 JUL Loss, 5-7 1.1 2 1 1 0 0
PERSONALITY
Nothing stands out about Yamaguchi.
Birthday:05/31/2005
Born in:Saiki, OIT
Nationality:Japanese
Height:6' 7"
Weight:200 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:3 Years
Arbitration Eligibility:Not yet eligible
Option Years:3 option years left
Contract Extension: -
Drafted:-
ABA CLASS A- 2026 PITCHING STATS
Pitching G GS W L SV ERA IP HA R ER HR BB K CG CG% SHO QS QS%
Overall 39 0 1 4 1 9.00 60.0 89 64 60 17 20 23 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 3 25.0 39 19 16.80 13.35 3.45 3.00 7.53 1.82 141 -1.1 .330        
Pitching AB H 2B 3B HR R BB K SF SH HP AVG OBP SLG OPS      
vs. LHB 69 25 5 0 3 17 5 6 1 0 1 .362 .408 .565 .973      
vs. RHB 187 64 11 3 14 47 15 17 1 0 2 .342 .395 .658 1.053      
ABA CLASS A- 2026 PITCHING SPLITS
Split G GS W L SV ERA IP HA R ER HR BB K  
This Week 1 0 1 0 0 3.00 3.0 4 1 1 0 1 1  
Last Week 2 0 0 0 0 7.71 2.1 3 2 2 0 1 3  
April 9 0 0 2 1 13.91 11.0 22 17 17 6 6 5  
May 8 0 0 0 0 4.76 17.0 16 10 9 2 3 9  
June 9 0 0 1 0 11.91 11.1 24 18 15 4 5 1  
July 10 0 0 1 0 9.39 15.1 20 16 16 5 4 4  
August 3 0 1 0 0 5.06 5.1 7 3 3 0 2 4  
Last Year 10 0 2 0 0 5.64 22.1 19 14 14 4 7 13  
Career 49 0 3 4 1 8.09 82.1 108 78 74 21 27 36  
Home 15 0 0 0 0 6.20 24.2 31 17 17 3 5 13  
Road 24 0 1 4 1 10.95 35.1 58 47 43 14 15 10  
Grass 32 0 1 4 1 8.28 50.0 70 50 46 12 15 21  
Turf 7 0 0 0 0 12.60 10.0 19 14 14 5 5 2  
Day 9 0 1 0 0 12.34 11.2 23 16 16 3 5 2  
Night 30 0 0 4 1 8.19 48.1 66 48 44 14 15 21  
As Reliever / Substitution 39 0 1 4 1 9.00 60.0 89 64 60 17 20 23  
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+
2024 Long Island - R 19 25 6 3 2 1 8.63 57.1 86 57 55 18 22 41 0 0 1.88 .354 7.35 -0.1 72
2025 Long Island - R 20 15 11 3 3 0 5.46 56.0 86 41 34 7 17 23 0 0 1.84 .366 6.32 0.7 116
2025 Newport - A- 20 10 0 2 0 0 5.64 22.1 19 14 14 4 7 13 0 0 1.16 .221 5.93 0.1 108
2026 Newport - A- 21 39 0 1 4 1 9.00 60.0 89 64 60 17 20 23 0 0 1.82 .330 7.53 -1.1 59
Total AR 40 17 6 5 1 7.07 113.1 172 98 89 25 39 64 0 0 1.86 .360 6.84 88.4
Total A- 49 0 3 4 1 8.09 82.1 108 78 74 21 27 36 0 0 1.64 .304 7.10 67.5
CAREER FIELDING STATS
Year/Team/League POS G GS PO A DP TC E PCT INN RNG ZR EFF PB RSTA RTO RTO%
2026 Newport - A- P 38 0 3 3 0 6 0 1.000 60.0 0.90 +0.8 1.010
TOTAL P 38 0 3 3 0 6 0 1.000 60.0 0.90 +0.8 1.010
PLAYER HISTORY
04/30/2022 Signed a minor league contract out of Japan with the Boston Whistlers organization.
01/01/2023 OSA scouting updated ratings (potential): Stuff: 30 (35); Movement: 30 (40); Control: 35 (50).
01/01/2023 OSA scouting updated ratings (potential): Stuff: 30 (35); Movement: 30 (40); Control: 35 (50).
01/01/2024 OSA scouting updated ratings (potential): Stuff: 20 (40); Movement: 20 (40); Control: 30 (65).
01/01/2025 OSA scouting updated ratings (potential): Stuff: 30 (40); Movement: 20 (45); Control: 30 (75).
06/17/2025 Injured (partially torn labrum),out for 6 weeks.
01/01/2026 OSA scouting updated ratings (potential): Stuff: 30 (40); Movement: 20 (45); Control: 30 (70).
05/12/2026 Injured (mild hamstring strain),day-to-day for 4 days.
Friday, May 29th , 2026 - OOTP Baseball 26.8 Build 82