Mason Olson
Toronto Blue Jays (A)P
Age: 24
Bats/Throws: R/L
5'10" / 165
DOB: 12/23/2001
(24 years, 3 months, 10 days)
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Preseason ProjectionsIn-Season ProjectionsMinor Leagues
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025 | TOR | CPX | 23 | 2 | 1 | 0 | 3 | 2 | 15.2 | 10.34 | 2.30 | 0.00 | .300 | 81.3% | 69.2% | 0.0% | 1.72 | 2.04 | 2.40 | ||||||
| 2025 | TOR | A | 23 | 3 | 2 | 0 | 6 | 2 | 20.2 | 9.15 | 3.48 | 0.00 | .327 | 72.4% | 60.0% | 0.0% | 3.48 | 3.11 | 3.62 | ||||||
| 2025 | TOR | MiLB | 23 | 5 | 3 | 0 | 9 | 4 | 36.1 | 9.66 | 2.97 | 0.00 | .316 | 75.6% | 64.0% | 0.0% | 2.72 | 2.65 | 3.09 | ||||||
| 2026 | Steamer | PROJ | 24 | 0 | 0 | 0 | 0 | 0 | 1.0 | 5.58 | 5.09 | 1.32 | .296 | 70.4% | 44.5% | 5.35 | 5.63 | 5.54 | 0.0 | ||||||
| 2026 | OOPSY | PROJ | 24 | 0 | 0 | 0 | 1 | 1 | 3.9 | 5.63 | 3.74 | 1.10 | .296 | 64.9% | 5.03 | 4.87 | 0.0 | ||||||||
| 2026 | Steamer | ROS | 24 | 0 | 0 | 0 | 0 | 0 | 1.0 | 5.75 | 5.22 | 1.30 | .298 | 70.3% | 5.37 | 5.61 | 0.0 | ||||||||
| 2026 | OOPSY | ROS | 24 | 0 | 0 | 0 | 1 | 1 | 3.9 | 5.63 | 3.74 | 1.10 | .296 | 64.9% | 5.03 | 4.87 | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025 | TOR | CPX | 23 | 2 | 1 | 0 | 3 | 2 | 15.2 | 10.34 | 2.30 | 0.00 | .300 | 81.3% | 69.2% | 0.0% | 1.72 | 2.04 | 2.40 | ||||||
| 2025 | TOR | A | 23 | 3 | 2 | 0 | 6 | 2 | 20.2 | 9.15 | 3.48 | 0.00 | .327 | 72.4% | 60.0% | 0.0% | 3.48 | 3.11 | 3.62 | ||||||
| 2025 | TOR | MiLB | 23 | 5 | 3 | 0 | 9 | 4 | 36.1 | 9.66 | 2.97 | 0.00 | .316 | 75.6% | 64.0% | 0.0% | 2.72 | 2.65 | 3.09 | ||||||
| 2026 | Steamer | PROJ | 24 | 0 | 0 | 0 | 0 | 0 | 1.0 | 5.58 | 5.09 | 1.32 | .296 | 70.4% | 44.5% | 5.35 | 5.63 | 5.54 | 0.0 | ||||||
| 2026 | OOPSY | PROJ | 24 | 0 | 0 | 0 | 1 | 1 | 3.9 | 5.63 | 3.74 | 1.10 | .296 | 64.9% | 5.03 | 4.87 | 0.0 | ||||||||
| 2026 | Steamer | ROS | 24 | 0 | 0 | 0 | 0 | 0 | 1.0 | 5.75 | 5.22 | 1.30 | .298 | 70.3% | 5.37 | 5.61 | 0.0 | ||||||||
| 2026 | OOPSY | ROS | 24 | 0 | 0 | 0 | 1 | 1 | 3.9 | 5.63 | 3.74 | 1.10 | .296 | 64.9% | 5.03 | 4.87 | 0.0 |
Preseason ProjectionsIn-Season ProjectionsMinor Leagues
| 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 QS - Quality Starts; pitched at least 6 innings and gave up 3 or fewer earned runs | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025 | TOR | CPX | 2 | 1 | 1.72 | 3 | 2 | 0 | 0 | 0 | 0 | 0 | 15.2 | 62 | 12 | 3 | 3 | 0 | 4 | 0 | 0 | 2 | 0 | 18 | |
| 2025 | TOR | A | 3 | 2 | 3.48 | 6 | 2 | 0 | 0 | 0 | 1 | 0 | 20.2 | 87 | 18 | 8 | 8 | 0 | 8 | 0 | 3 | 1 | 0 | 21 | |
| 2025 | TOR | MiLB | 5 | 3 | 2.72 | 9 | 4 | 0 | 0 | 0 | 1 | 0 | 36.1 | 149 | 30 | 11 | 11 | 0 | 12 | 0 | 3 | 3 | 0 | 39 | |
| 2026 | Steamer | PROJ | 0 | 0 | 5.35 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1.0 | 5 | 1 | 1 | 1 | 0 | 1 | 0 | 0 | 1 | |||
| 2026 | OOPSY | PROJ | 0 | 0 | 5.03 | 1 | 1 | 0 | 0 | 0 | 3.9 | 17 | 4 | 2 | 2 | 0 | 2 | 0 | 0 | 2 | |||||
| 2026 | Steamer | ROS | 0 | 0 | 5.37 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1.0 | 5 | 1 | 1 | 1 | 0 | 1 | 0 | 1 | ||||
| 2026 | OOPSY | ROS | 0 | 0 | 5.03 | 1 | 1 | 0 | 0 | 0 | 3.9 | 17 | 4 | 2 | 2 | 0 | 2 | 0 | 0 | 2 |
| 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 QS - Quality Starts; pitched at least 6 innings and gave up 3 or fewer earned runs | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025 | TOR | CPX | 2 | 1 | 1.72 | 3 | 2 | 0 | 0 | 0 | 0 | 0 | 15.2 | 62 | 12 | 3 | 3 | 0 | 4 | 0 | 0 | 2 | 0 | 18 | |
| 2025 | TOR | A | 3 | 2 | 3.48 | 6 | 2 | 0 | 0 | 0 | 1 | 0 | 20.2 | 87 | 18 | 8 | 8 | 0 | 8 | 0 | 3 | 1 | 0 | 21 | |
| 2025 | TOR | MiLB | 5 | 3 | 2.72 | 9 | 4 | 0 | 0 | 0 | 1 | 0 | 36.1 | 149 | 30 | 11 | 11 | 0 | 12 | 0 | 3 | 3 | 0 | 39 | |
| 2026 | Steamer | PROJ | 0 | 0 | 5.35 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1.0 | 5 | 1 | 1 | 1 | 0 | 1 | 0 | 0 | 1 | |||
| 2026 | OOPSY | PROJ | 0 | 0 | 5.03 | 1 | 1 | 0 | 0 | 0 | 3.9 | 17 | 4 | 2 | 2 | 0 | 2 | 0 | 0 | 2 | |||||
| 2026 | Steamer | ROS | 0 | 0 | 5.37 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1.0 | 5 | 1 | 1 | 1 | 0 | 1 | 0 | 1 | ||||
| 2026 | OOPSY | ROS | 0 | 0 | 5.03 | 1 | 1 | 0 | 0 | 0 | 3.9 | 17 | 4 | 2 | 2 | 0 | 2 | 0 | 0 | 2 |
Preseason ProjectionsIn-Season ProjectionsMinor LeaguesAverages
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025 | TOR | CPX | 10.34 | 2.30 | 4.50 | 0.00 | 29.0% | 6.5% | 22.6% | .207 | 1.02 | .300 | 81.3% | 41 | 48 | 2.04 | ||||
| 2025 | TOR | A | 9.15 | 3.48 | 2.63 | 0.00 | 24.1% | 9.2% | 14.9% | .237 | 1.26 | .327 | 72.4% | 81 | 72 | 3.11 | ||||
| 2025 | TOR | MiLB | 9.66 | 2.97 | 3.25 | 0.00 | 26.2% | 8.1% | 18.1% | .224 | 1.16 | .316 | 75.6% | 64 | 62 | 2.65 | ||||
| 2026 | Steamer | PROJ | 5.58 | 5.09 | 1.10 | 1.32 | 13.4% | 12.3% | 1.2% | .275 | 1.67 | .296 | 70.4% | 5.63 | ||||||
| 2026 | OOPSY | PROJ | 5.63 | 3.74 | 1.50 | 1.10 | 14.9% | 9.9% | 5.0% | .269 | 1.42 | .296 | 64.9% | 4.87 | ||||||
| 2026 | Steamer | ROS | 5.75 | 5.22 | 1.10 | 1.30 | 13.8% | 12.6% | 1.3% | .275 | 1.68 | .298 | 70.3% | 5.61 | ||||||
| 2026 | OOPSY | ROS | 5.63 | 3.74 | 1.50 | 1.10 | 14.9% | 9.9% | 5.0% | .269 | 1.42 | .296 | 64.9% | 4.87 |
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025 | TOR | CPX | 10.34 | 2.30 | 4.50 | 0.00 | 29.0% | 6.5% | 22.6% | .207 | 1.02 | .300 | 81.3% | 41 | 48 | 2.04 | ||||
| 2025 | TOR | A | 9.15 | 3.48 | 2.63 | 0.00 | 24.1% | 9.2% | 14.9% | .237 | 1.26 | .327 | 72.4% | 81 | 72 | 3.11 | ||||
| 2025 | TOR | MiLB | 9.66 | 2.97 | 3.25 | 0.00 | 26.2% | 8.1% | 18.1% | .224 | 1.16 | .316 | 75.6% | 64 | 62 | 2.65 | ||||
| 2026 | Steamer | PROJ | 5.58 | 5.09 | 1.10 | 1.32 | 13.4% | 12.3% | 1.2% | .275 | 1.67 | .296 | 70.4% | 5.63 | ||||||
| 2026 | OOPSY | PROJ | 5.63 | 3.74 | 1.50 | 1.10 | 14.9% | 9.9% | 5.0% | .269 | 1.42 | .296 | 64.9% | 4.87 | ||||||
| 2026 | Steamer | ROS | 5.75 | 5.22 | 1.10 | 1.30 | 13.8% | 12.6% | 1.3% | .275 | 1.68 | .298 | 70.3% | 5.61 | ||||||
| 2026 | OOPSY | ROS | 5.63 | 3.74 | 1.50 | 1.10 | 14.9% | 9.9% | 5.0% | .269 | 1.42 | .296 | 64.9% | 4.87 |
