Jack Jasiak
Cleveland Guardians (A+)P
Age: 24
Bats/Throws: R/R
6'1" / 198
DOB: 3/6/2001
(24 years, 1 month, 23 days)
P
Quick Links
More
Stats
Stat Groups:
Select
You can shift + click on full MLB seasons in Season Stats and games in Game Logs to select spans for aggregate stats. Read more here
Preseason ProjectionsIn-Season ProjectionsMinor LeaguesSpring TrainingCollege
| Season | Team | Level | Age | W W - Wins | L L - Losses | SV SV - Saves | G G - Games Pitched | GS GS - Games Started | IP IP - Innings Pitched | divider | K/9 K/9 - Strikeouts per 9 Innings ((SO*9)/IP) | BB/9 BB/9 - Walks per 9 Innings ((BB*9)/IP) | HR/9 HR/9 - Home Runs per 9 Innings ((HR*9)/IP) | BABIP BABIP - Batting Average on Balls in Play | LOB% LOB% - Left on Base Percentage | GB% GB% - Ground Ball Percentage (GB/BIP) | HR/FB HR/FB - Home Run to Fly Ball Ratio | divider | vFA vFA - Fourseam Fastball velocity (Pitch Info) | divider | ERA ERA - Earned Run Average ((ER*9)/IP) | xERA xERA - Expected ERA | FIP FIP - Fielder Independent Pitching on an ERA scale | xFIP xFIP - Expected Fielder Independent Pitching where Home Runs are calculated as 10.5% of Fly Balls induced | WAR WAR - Wins Above Replacement |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021 | USF | NCAA | 20 | 6 | 7 | 0 | 16 | 16 | 98.1 | 8.51 | 2.11 | 0.64 | .257 | 70.3% | 2.93 | 3.21 | |||||||||
| 2022 | USF | NCAA | 21 | 2 | 0 | 0 | 5 | 5 | 27.1 | 9.88 | 0.66 | 0.33 | .227 | 73.9% | 1.32 | 1.81 | |||||||||
| 2023 | CLE | A | 22 | 2 | 1 | 1 | 32 | 0 | 68.2 | 6.55 | 4.85 | 0.66 | .297 | 71.8% | 32.2% | 5.1% | 4.46 | 5.07 | 5.60 | ||||||
| 2024 | CLE | A | 23 | 7 | 5 | 1 | 32 | 2 | 67.0 | 8.33 | 2.96 | 0.81 | .345 | 68.6% | 36.9% | 8.8% | 4.57 | 4.24 | 3.99 | ||||||
| 2025 | CLE | ST | 24 | 0 | 0 | 1 | 2 | 0 | 1.1 | 0.00 | 0.00 | 6.75 | .200 | 100.0% | 33.3% | 50.0% | 6.75 | 13.48 | 6.39 | ||||||
| 2025 | Steamer | PROJ | 24 | 0 | 0 | 0 | 1 | 0 | 1.0 | 4.95 | 5.26 | 1.62 | .295 | 67.8% | 39.3% | 6.23 | 6.32 | 6.10 | 0.0 | ||||||
| 2025 | OOPSY | PROJ | 24 | 0 | 0 | 0 | 1 | 1 | 2.1 | 3.82 | 4.51 | 1.58 | .283 | 62.4% | 6.29 | 6.26 | 0.0 | ||||||||
| 2025 | CLE | A+ | 24 | 4 | 0 | 0 | 5 | 0 | 13.0 | 6.23 | 1.38 | 0.00 | .231 | 100.0% | 41.0% | 0.0% | 0.00 | 2.83 | 4.01 | ||||||
| 2025 | Steamer | ROS | 0 | 0 | 0 | 1 | 0 | 1.0 | 5.28 | 4.85 | 1.48 | .294 | 68.6% | 5.79 | 5.81 | 0.0 | |||||||||
| 2025 | OOPSY | ROS | 24 | 0 | 0 | 0 | 1 | 1 | 2.2 | 3.79 | 4.18 | 1.62 | .282 | 61.6% | 6.27 | 6.21 | 0.0 |
| Season | Team | Level | Age | W W - Wins | L L - Losses | SV SV - Saves | G G - Games Pitched | GS GS - Games Started | IP IP - Innings Pitched | divider | K/9 K/9 - Strikeouts per 9 Innings ((SO*9)/IP) | BB/9 BB/9 - Walks per 9 Innings ((BB*9)/IP) | HR/9 HR/9 - Home Runs per 9 Innings ((HR*9)/IP) | BABIP BABIP - Batting Average on Balls in Play | LOB% LOB% - Left on Base Percentage | GB% GB% - Ground Ball Percentage (GB/BIP) | HR/FB HR/FB - Home Run to Fly Ball Ratio | divider | vFA vFA - Fourseam Fastball velocity (Pitch Info) | divider | ERA ERA - Earned Run Average ((ER*9)/IP) | xERA xERA - Expected ERA | FIP FIP - Fielder Independent Pitching on an ERA scale | xFIP xFIP - Expected Fielder Independent Pitching where Home Runs are calculated as 10.5% of Fly Balls induced | WAR WAR - Wins Above Replacement |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021 | USF | NCAA | 20 | 6 | 7 | 0 | 16 | 16 | 98.1 | 8.51 | 2.11 | 0.64 | .257 | 70.3% | 2.93 | 3.21 | |||||||||
| 2022 | USF | NCAA | 21 | 2 | 0 | 0 | 5 | 5 | 27.1 | 9.88 | 0.66 | 0.33 | .227 | 73.9% | 1.32 | 1.81 | |||||||||
| 2023 | CLE | A | 22 | 2 | 1 | 1 | 32 | 0 | 68.2 | 6.55 | 4.85 | 0.66 | .297 | 71.8% | 32.2% | 5.1% | 4.46 | 5.07 | 5.60 | ||||||
| 2024 | CLE | A | 23 | 7 | 5 | 1 | 32 | 2 | 67.0 | 8.33 | 2.96 | 0.81 | .345 | 68.6% | 36.9% | 8.8% | 4.57 | 4.24 | 3.99 | ||||||
| 2025 | CLE | ST | 24 | 0 | 0 | 1 | 2 | 0 | 1.1 | 0.00 | 0.00 | 6.75 | .200 | 100.0% | 33.3% | 50.0% | 6.75 | 13.48 | 6.39 | ||||||
| 2025 | Steamer | PROJ | 24 | 0 | 0 | 0 | 1 | 0 | 1.0 | 4.95 | 5.26 | 1.62 | .295 | 67.8% | 39.3% | 6.23 | 6.32 | 6.10 | 0.0 | ||||||
| 2025 | OOPSY | PROJ | 24 | 0 | 0 | 0 | 1 | 1 | 2.1 | 3.82 | 4.51 | 1.58 | .283 | 62.4% | 6.29 | 6.26 | 0.0 | ||||||||
| 2025 | CLE | A+ | 24 | 4 | 0 | 0 | 5 | 0 | 13.0 | 6.23 | 1.38 | 0.00 | .231 | 100.0% | 41.0% | 0.0% | 0.00 | 2.83 | 4.01 | ||||||
| 2025 | Steamer | ROS | 0 | 0 | 0 | 1 | 0 | 1.0 | 5.28 | 4.85 | 1.48 | .294 | 68.6% | 5.79 | 5.81 | 0.0 | |||||||||
| 2025 | OOPSY | ROS | 24 | 0 | 0 | 0 | 1 | 1 | 2.2 | 3.79 | 4.18 | 1.62 | .282 | 61.6% | 6.27 | 6.21 | 0.0 |
Preseason ProjectionsIn-Season ProjectionsMinor LeaguesSpring TrainingCollege
| Season | Team | Level | W W - Wins | L L - Losses | ERA ERA - Earned Run Average ((ER*9)/IP) | G G - Games Pitched | GS GS - Games Started | QS | CG CG - Complete Games | ShO ShO - Shoutouts | SV SV - Saves | HLD HLD - Holds | BS BS - Blown Saves | IP IP - Innings Pitched | TBF TBF - Total Batters Faced | H H - Hits Allowed | R R - Runs Allowed | ER ER - Earned Runs | HR HR - Home Runs | BB BB - Walks | IBB IBB - Intentional | HBP HBP - Hit Batters | WP WP - Wild Pitches | BK BK - Balks | SO SO - Strikeouts |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021 | USF | NCAA | 6 | 7 | 2.93 | 16 | 16 | 1 | 0 | 0 | 98.1 | 400 | 76 | 39 | 32 | 7 | 23 | 9 | 1 | 0 | 93 | ||||
| 2022 | USF | NCAA | 2 | 0 | 1.32 | 5 | 5 | 0 | 0 | 0 | 27.1 | 100 | 16 | 6 | 4 | 1 | 2 | 1 | 3 | 0 | 30 | ||||
| 2023 | CLE | A | 2 | 1 | 4.46 | 32 | 0 | 0 | 0 | 1 | 6 | 1 | 68.2 | 307 | 67 | 36 | 34 | 5 | 37 | 0 | 6 | 3 | 0 | 50 | |
| 2024 | CLE | A | 7 | 5 | 4.57 | 32 | 2 | 0 | 0 | 1 | 1 | 4 | 67.0 | 301 | 76 | 39 | 34 | 6 | 22 | 0 | 8 | 7 | 0 | 62 | |
| 2025 | CLE | ST | 0 | 0 | 6.75 | 2 | 0 | 0 | 0 | 1 | 0 | 0 | 1.1 | 6 | 2 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | |
| 2025 | Steamer | PROJ | 0 | 0 | 6.23 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1.0 | 5 | 1 | 1 | 1 | 0 | 1 | 0 | 0 | 1 | |||
| 2025 | OOPSY | PROJ | 0 | 0 | 6.29 | 1 | 1 | 0 | 0 | 0 | 2.1 | 9 | 2 | 2 | 1 | 0 | 1 | 0 | 0 | 1 | |||||
| 2025 | CLE | A+ | 4 | 0 | 0.00 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 13.0 | 51 | 9 | 0 | 0 | 0 | 2 | 0 | 1 | 0 | 0 | 9 | |
| 2025 | Steamer | ROS | 0 | 0 | 5.79 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1.0 | 5 | 1 | 1 | 1 | 0 | 1 | 0 | 1 | ||||
| 2025 | OOPSY | ROS | 0 | 0 | 6.27 | 1 | 1 | 0 | 0 | 0 | 2.2 | 10 | 2 | 2 | 2 | 0 | 1 | 0 | 0 | 1 |
| Season | Team | Level | W W - Wins | L L - Losses | ERA ERA - Earned Run Average ((ER*9)/IP) | G G - Games Pitched | GS GS - Games Started | QS | CG CG - Complete Games | ShO ShO - Shoutouts | SV SV - Saves | HLD HLD - Holds | BS BS - Blown Saves | IP IP - Innings Pitched | TBF TBF - Total Batters Faced | H H - Hits Allowed | R R - Runs Allowed | ER ER - Earned Runs | HR HR - Home Runs | BB BB - Walks | IBB IBB - Intentional | HBP HBP - Hit Batters | WP WP - Wild Pitches | BK BK - Balks | SO SO - Strikeouts |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021 | USF | NCAA | 6 | 7 | 2.93 | 16 | 16 | 1 | 0 | 0 | 98.1 | 400 | 76 | 39 | 32 | 7 | 23 | 9 | 1 | 0 | 93 | ||||
| 2022 | USF | NCAA | 2 | 0 | 1.32 | 5 | 5 | 0 | 0 | 0 | 27.1 | 100 | 16 | 6 | 4 | 1 | 2 | 1 | 3 | 0 | 30 | ||||
| 2023 | CLE | A | 2 | 1 | 4.46 | 32 | 0 | 0 | 0 | 1 | 6 | 1 | 68.2 | 307 | 67 | 36 | 34 | 5 | 37 | 0 | 6 | 3 | 0 | 50 | |
| 2024 | CLE | A | 7 | 5 | 4.57 | 32 | 2 | 0 | 0 | 1 | 1 | 4 | 67.0 | 301 | 76 | 39 | 34 | 6 | 22 | 0 | 8 | 7 | 0 | 62 | |
| 2025 | CLE | ST | 0 | 0 | 6.75 | 2 | 0 | 0 | 0 | 1 | 0 | 0 | 1.1 | 6 | 2 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | |
| 2025 | Steamer | PROJ | 0 | 0 | 6.23 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1.0 | 5 | 1 | 1 | 1 | 0 | 1 | 0 | 0 | 1 | |||
| 2025 | OOPSY | PROJ | 0 | 0 | 6.29 | 1 | 1 | 0 | 0 | 0 | 2.1 | 9 | 2 | 2 | 1 | 0 | 1 | 0 | 0 | 1 | |||||
| 2025 | CLE | A+ | 4 | 0 | 0.00 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 13.0 | 51 | 9 | 0 | 0 | 0 | 2 | 0 | 1 | 0 | 0 | 9 | |
| 2025 | Steamer | ROS | 0 | 0 | 5.79 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1.0 | 5 | 1 | 1 | 1 | 0 | 1 | 0 | 1 | ||||
| 2025 | OOPSY | ROS | 0 | 0 | 6.27 | 1 | 1 | 0 | 0 | 0 | 2.2 | 10 | 2 | 2 | 2 | 0 | 1 | 0 | 0 | 1 |
Preseason ProjectionsIn-Season ProjectionsMinor LeaguesSpring TrainingAveragesCollege
| Season | Team | Level | K/9 K/9 - Strikeouts per 9 Innings ((SO*9)/IP) | BB/9 BB/9 - Walks per 9 Innings ((BB*9)/IP) | K/BB K/BB - Strikeout to Walk Ratio (SO/BB) | HR/9 HR/9 - Home Runs per 9 Innings ((HR*9)/IP) | divider | K% K% - Strikeout Percentage (SO/TBF) | BB% BB% - Walk Percentage (BB/TBF) | K-BB% K-BB% - The difference between strikeout percentage and walk percentage | divider | AVG AVG - Batting Average Against | WHIP WHIP - Walks + Hits divided by Innings Pitched | BABIP BABIP - Batting Average on Balls in Play | LOB% LOB% - Left on Base Percentage | divider | ERA- ERA- - ERA adjusted for park and league where 100 is average and lower is better | FIP- FIP- - FIP adjusted for park and league where 100 is average and lower is better | divider | FIP FIP - Fielder Independent Pitching on an ERA scale |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021 | USF | NCAA | 8.51 | 2.11 | 4.04 | 0.64 | 23.3% | 5.8% | 17.5% | .207 | 1.01 | .257 | 70.3% | 3.21 | ||||||
| 2022 | USF | NCAA | 9.88 | 0.66 | 15.00 | 0.33 | 30.0% | 2.0% | 28.0% | .165 | 0.66 | .227 | 73.9% | 1.81 | ||||||
| 2023 | CLE | A | 6.55 | 4.85 | 1.35 | 0.66 | 16.3% | 12.1% | 4.2% | .254 | 1.51 | .297 | 71.8% | 107 | 122 | 5.07 | ||||
| 2024 | CLE | A | 8.33 | 2.96 | 2.82 | 0.81 | 20.6% | 7.3% | 13.3% | .280 | 1.46 | .345 | 68.6% | 119 | 111 | 4.24 | ||||
| 2025 | CLE | ST | 0.00 | 0.00 | 0.00 | 6.75 | 0.0% | 0.0% | 0.0% | .333 | 1.50 | .200 | 100.0% | 136 | 275 | 13.48 | ||||
| 2025 | Steamer | PROJ | 4.95 | 5.26 | 0.94 | 1.62 | 11.7% | 12.4% | -0.7% | .286 | 1.75 | .295 | 67.8% | 6.32 | ||||||
| 2025 | OOPSY | PROJ | 3.82 | 4.51 | 0.85 | 1.58 | 9.4% | 11.1% | -1.7% | .284 | 1.62 | .283 | 62.4% | 6.26 | ||||||
| 2025 | CLE | A+ | 6.23 | 1.38 | 4.50 | 0.00 | 17.6% | 3.9% | 13.7% | .188 | 0.85 | .231 | 100.0% | 0 | 65 | 2.83 | ||||
| 2025 | Steamer | ROS | 5.28 | 4.85 | 1.09 | 1.48 | 12.6% | 11.6% | 1.0% | .280 | 1.67 | .294 | 68.6% | 5.81 | ||||||
| 2025 | OOPSY | ROS | 3.79 | 4.18 | 0.91 | 1.62 | 9.5% | 10.5% | -1.0% | .284 | 1.58 | .282 | 61.6% | 6.21 |
| Season | Team | Level | K/9 K/9 - Strikeouts per 9 Innings ((SO*9)/IP) | BB/9 BB/9 - Walks per 9 Innings ((BB*9)/IP) | K/BB K/BB - Strikeout to Walk Ratio (SO/BB) | HR/9 HR/9 - Home Runs per 9 Innings ((HR*9)/IP) | divider | K% K% - Strikeout Percentage (SO/TBF) | BB% BB% - Walk Percentage (BB/TBF) | K-BB% K-BB% - The difference between strikeout percentage and walk percentage | divider | AVG AVG - Batting Average Against | WHIP WHIP - Walks + Hits divided by Innings Pitched | BABIP BABIP - Batting Average on Balls in Play | LOB% LOB% - Left on Base Percentage | divider | ERA- ERA- - ERA adjusted for park and league where 100 is average and lower is better | FIP- FIP- - FIP adjusted for park and league where 100 is average and lower is better | divider | FIP FIP - Fielder Independent Pitching on an ERA scale |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021 | USF | NCAA | 8.51 | 2.11 | 4.04 | 0.64 | 23.3% | 5.8% | 17.5% | .207 | 1.01 | .257 | 70.3% | 3.21 | ||||||
| 2022 | USF | NCAA | 9.88 | 0.66 | 15.00 | 0.33 | 30.0% | 2.0% | 28.0% | .165 | 0.66 | .227 | 73.9% | 1.81 | ||||||
| 2023 | CLE | A | 6.55 | 4.85 | 1.35 | 0.66 | 16.3% | 12.1% | 4.2% | .254 | 1.51 | .297 | 71.8% | 107 | 122 | 5.07 | ||||
| 2024 | CLE | A | 8.33 | 2.96 | 2.82 | 0.81 | 20.6% | 7.3% | 13.3% | .280 | 1.46 | .345 | 68.6% | 119 | 111 | 4.24 | ||||
| 2025 | CLE | ST | 0.00 | 0.00 | 0.00 | 6.75 | 0.0% | 0.0% | 0.0% | .333 | 1.50 | .200 | 100.0% | 136 | 275 | 13.48 | ||||
| 2025 | Steamer | PROJ | 4.95 | 5.26 | 0.94 | 1.62 | 11.7% | 12.4% | -0.7% | .286 | 1.75 | .295 | 67.8% | 6.32 | ||||||
| 2025 | OOPSY | PROJ | 3.82 | 4.51 | 0.85 | 1.58 | 9.4% | 11.1% | -1.7% | .284 | 1.62 | .283 | 62.4% | 6.26 | ||||||
| 2025 | CLE | A+ | 6.23 | 1.38 | 4.50 | 0.00 | 17.6% | 3.9% | 13.7% | .188 | 0.85 | .231 | 100.0% | 0 | 65 | 2.83 | ||||
| 2025 | Steamer | ROS | 5.28 | 4.85 | 1.09 | 1.48 | 12.6% | 11.6% | 1.0% | .280 | 1.67 | .294 | 68.6% | 5.81 | ||||||
| 2025 | OOPSY | ROS | 3.79 | 4.18 | 0.91 | 1.62 | 9.5% | 10.5% | -1.0% | .284 | 1.58 | .282 | 61.6% | 6.21 |
