P Jacob Kostyshock #37
Age: 28 | Bats: R | Throws: R | Morale: Normal
10/29/2026
 OA: 40 POT: 40
BNN Index | | SCORES | STANDINGS | STATS | TEAMS | PLAYERS | TRANSACTIONS | HISTORY
P JACOB KOSTYSHOCK #37 - AGE: 28 - BATS: R - THROWS: R - MORALE: NORMAL
G GS Rec SV ERA IP HA HR BB K WHIP WAR
4 0 0-0 0 0.00 3.1 2 0 4 4 1.80 -0.0
PITCHING RATINGS (OSA)
Overall Pot. Overall Vs Left Vs Right Pot.
Stuff 55 50 55 55
Movement 50 45 50 50
Control 40 40 40 40
PITCHING RATINGS
Pitch Cur. Pot.
Fastball 65 65
Slider 55 60
Changeup 40 40
 
 
OTHER PITCHING RATINGS
Velocity 96-98 Mph
Stamina 30
Suggested Role Bullpen
Type Neutral
Hold Runners 55
Defense 45
RUN/BUNT RATINGS
Running Speed: 20
Stealing Ability: 25
Baserunning Inst.: 30
Sacrifice Bunt: 30
Bunt for Hit: 20
   
GAME LOG, LAST 10 GAMES
Date Vs. Result Start IP H R ER BB K Dec
04/25/2026 OKL Loss, 6-7 2.0 1 0 0 3 3
04/20/2026 @ REN Loss, 1-4 0.1 0 0 0 0 0
04/15/2026 RR Win, 4-0 0.2 1 0 0 1 0
04/14/2026 RR Loss, 4-6 0.1 0 0 0 0 1
PERSONALITY
Jacob is conscientious about his work habits.
Personality Class: Sparkplug
High: Adaptability, Work Ethic
Low: Loyalty
Birthday:01/02/1998
Born in:O'Fallon, MO
Nationality:American
Height:6' 4"
Weight:195 lbs
Local Popularity:Insignificant
National Pop.:Insignificant
STATUS
Contract:None, Free Agent
Salary:-
Signed Through:-
Major Service:2 Years, 18 Days
Service This Yr:25 Days
40-Man Service:2 Years, 53 Days
Pro Service:6 Years
Arbitration Eligibility:Not yet, but possibly eligible after this season
Option Years:1 option year left
Contract Extension: -
Drafted:-
TRIPLE-A WEST 2026 PITCHING STATS
Pitching G GS W L SV ERA IP HA R ER HR BB K CG CG% SHO QS QS%
Overall 4 0 0 0 0 0.00 3.1 2 0 0 0 4 4 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 0 0 0.0 4 2 16.20 5.40 10.80 10.80 4.64 1.80 113 -0.0 .250        
Pitching AB H 2B 3B HR R BB K SF SH HP AVG OBP SLG OPS      
vs. LHB 4 1 0 0 0 0 3 1 0 0 0 .250 .571 .250 .821      
vs. RHB 8 1 1 0 0 0 1 3 0 0 0 .125 .222 .250 .472      
TRIPLE-A WEST 2026 PITCHING SPLITS
Split G GS W L SV ERA IP HA R ER HR BB K  
April 4 0 0 0 0 0.00 3.1 2 0 0 0 4 4  
2 Years Ago 11 0 1 0 7 2.76 16.1 15 5 5 1 5 26  
Career 63 0 5 7 29 2.97 78.2 79 34 26 9 32 108  
Home 3 0 0 0 0 0.00 3.0 2 0 0 0 4 4  
Road 1 0 0 0 0 0.00 0.1 0 0 0 0 0 0  
Grass 4 0 0 0 0 0.00 3.1 2 0 0 0 4 4  
Day 1 0 0 0 0 0.00 2.0 1 0 0 0 3 3  
Night 3 0 0 0 0 0.00 1.1 1 0 0 0 1 1  
As Reliever / Substitution 4 0 0 0 0 0.00 3.1 2 0 0 0 4 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+
2014 Total - 16 1 0 0 0 0 18.00 1.0 1 2 2 0 3 0 0 0 4.00 .000 12.20 -0.1 100
2023 Seattle - COBB 25 6 0 0 0 1 9.45 6.2 10 9 7 3 4 7 0 0 2.10 .368 9.43 -0.4 45
2024 Seattle - COBB 26 30 5 1 5 1 4.64 54.1 49 29 28 5 19 53 0 0 1.25 .303 3.96 0.7 93
2025 Seattle - COBB 27 9 0 0 3 1 6.39 12.2 13 9 9 2 6 14 0 0 1.50 .314 3.68 0.1 66
Total COBB 45 5 1 8 3 5.38 73.2 72 47 44 10 29 74 0 0 1.37 .312 4.41 0.4 80
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+
2019 Grand Junction - R 21 14 0 2 1 0 1.65 16.1 11 4 3 1 2 17 0 0 0.80 .250 2.65 0.3 242
2021 Fresno - A 23 11 0 1 0 2 0.87 10.1 4 1 1 0 1 16 0 0 0.48 .200 1.10 0.6 545
2021 Spokane - A+ 23 9 0 0 1 5 1.93 9.1 5 2 2 2 5 16 0 0 1.07 .188 5.12 0.0 253
2021 Total - A+ 23 20 0 1 1 7 1.37 19.2 9 3 3 2 6 32 0 0 0.76 .194 3.01 0.6 352
2021 Hartford - AA 23 12 0 1 1 4 2.63 13.2 10 4 4 2 4 17 0 0 1.02 .267 3.39 0.2 147
2022 Spokane - A+ 24 32 0 2 0 5 2.86 34.2 27 11 11 4 10 43 0 0 1.07 .287 5.33 0.7 238
2023 Tacoma - AAA 25 48 0 4 7 22 3.20 59.0 62 29 21 8 23 78 0 0 1.44 .362 4.14 1.1 152
2024 Tacoma - AAA 26 11 0 1 0 7 2.76 16.1 15 5 5 1 5 26 0 0 1.22 .389 1.74 0.8 140
2026 Tacoma - AAA 28 4 0 0 0 0 0.00 3.1 2 0 0 0 4 4 0 0 1.80 .250 4.64 -0.0 999
Total AAA W 63 0 5 7 29 2.97 78.2 79 34 26 9 32 108 0 0 1.41 .363 3.66 156.1
Total AA NE 12 0 1 1 4 2.63 13.2 10 4 4 2 4 17 0 0 1.02 .267 3.39 147.5
Total A+ W 41 0 2 1 10 2.66 44.0 32 13 13 6 15 59 0 0 1.07 .271 5.29 241.4
Total A W 11 0 1 0 2 0.87 10.1 4 1 1 0 1 16 0 0 0.48 .200 1.10 545.0
Total PIO 14 0 2 1 0 1.65 16.1 11 4 3 1 2 17 0 0 0.80 .250 2.65 242.0
CAREER FIELDING STATS
Year/Team/League POS G GS PO A DP TC E PCT INN RNG ZR EFF PB RSTA RTO RTO%
2023 Seattle - MLB P 6 0 0 0 0 0 0 .000 6.2 0.00 -0.0 .000
2024 Seattle - MLB P 29 5 2 5 0 10 3 .700 54.1 1.16 +0.7 1.007
2025 Seattle - MLB P 9 0 0 0 0 0 0 .000 12.2 0.00 -0.0 .000
2026 Tacoma - AAA P 4 0 0 0 0 0 0 .000 3.1 0.00 -0.0 .000
TOTAL P 48 5 2 5 0 10 3 .700 77.0 0.82 +0.6 1.007
PLAYER HISTORY
06/04/2019 Drafted by the Colorado Rockies in the 8th round of the 2019 MLB June Amateur Draft from University of Arkansas (Fayetteville, AR).
06/26/2021 Injured (mild shoulder strain),day-to-day for one week.
10/12/2021 Wins the 2021 Low-A West Round 2 with the Fresno Grizzlies!
11/07/2021 Signed a 1-year minor league contract extension with the Colorado Rockies organization.
01/01/2022 OSA scouting updated ratings (potential): Stuff: 50 (60); Movement: 40 (50); Control: 40 (50).
05/07/2022 Injured (mild oblique strain),day-to-day for 1 day.
06/26/2022 Injured (pulled abdominal muscle),day-to-day for one week.
12/05/2022 Was traded by the Colorado Rockies to the Seattle Mariners, along with RF Rece Hinds, RF Jhon Torres, in exchange for 3B Ke'Bryan Hayes.
01/01/2023 OSA scouting updated ratings (potential): Stuff: 55 (60); Movement: 45 (50); Control: 45 (50).
07/09/2023 Was selected to the 2023 COBB All-Star Futures Game.
11/20/2023 Received a 1-year contract through automatic renewal worth a total of $570,500.
01/01/2024 OSA scouting updated ratings (potential): Stuff: 60 (65); Movement: 50 (55); Control: 50 (55).
08/31/2024 Injured (finger blister),day-to-day for 2 days.
11/25/2024 Received a 1-year contract through automatic renewal worth a total of $570,500.
01/01/2025 OSA scouting updated ratings (potential): Stuff: 65 (65); Movement: 60 (60); Control: 55 (55).
04/15/2025 Injured (torn UCL),out for 12 months.
12/01/2025 Received a 1-year contract through automatic renewal worth a total of $570,500.
01/01/2026 OSA scouting updated ratings (potential): Stuff: 60 (60); Movement: 55 (55); Control: 50 (50).
04/27/2026 Released by the Seattle organization.
Thursday, May 19th , 2022 - OOTP Baseball 22.12 Build 86