Mason Olson
Toronto Blue Jays (AA)P
Age: 24
Bats/Throws: R/L
5'10" / 165
DOB: 12/23/2001
(24 years, 8 months, 16 days)
P
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Preseason ProjectionsIn-Season ProjectionsMinor Leagues
| Season | Team | Level | Age | W | L | SV | G | GS | IP | divider | K/9 | BB/9 | HR/9 | BABIP | LOB% | GB% | HR/FB | divider | vFA | divider | ERA | xERA | FIP | xFIP | WAR |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 4.01 | 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 | 4.01 | 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 | TOR | A+ | 24 | 0 | 0 | 0 | 1 | 0 | 3.1 | 8.10 | 2.70 | 0.00 | .222 | 75.0% | 44.4% | 0.0% | 2.70 | 3.72 | 5.39 | ||||||
| 2026 | TOR | AA | 24 | 4 | 4 | 0 | 30 | 8 | 81.2 | 9.81 | 2.53 | 1.21 | .303 | 62.4% | 46.9% | 17.7% | 4.85 | 4.38 | 4.04 | ||||||
| 2026 | TOR | AAA | 24 | 1 | 0 | 0 | 2 | 0 | 6.1 | 8.53 | 5.68 | 1.42 | .294 | 93.8% | 27.8% | 12.5% | 2.84 | 6.27 | 6.02 | 6.28 | |||||
| 2026 | TOR | MiLB | 24 | 5 | 4 | 0 | 33 | 8 | 91.1 | 9.66 | 2.76 | 1.18 | .299 | 65.6% | 45.4% | 16.4% | 4.63 | 6.27 | 4.47 | 4.24 | |||||
| 2026 | Steamer | ROS | 24 | 0 | 0 | 0 | 1 | 0 | 1.0 | 6.87 | 3.17 | 1.14 | .296 | 72.0% | 4.28 | 4.46 | 0.0 | ||||||||
| 2026 | OOPSY | ROS | 24 | 0 | 0 | 0 | 1 | 1 | 3.0 | 6.38 | 3.47 | 1.20 | .292 | 67.3% | 4.81 | 4.76 | 0.0 |
| Season | Team | Level | Age | W | L | SV | G | GS | IP | divider | K/9 | BB/9 | HR/9 | BABIP | LOB% | GB% | HR/FB | divider | vFA | divider | ERA | xERA | FIP | xFIP | WAR |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 4.01 | 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 | 4.01 | 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 | TOR | A+ | 24 | 0 | 0 | 0 | 1 | 0 | 3.1 | 8.10 | 2.70 | 0.00 | .222 | 75.0% | 44.4% | 0.0% | 2.70 | 3.72 | 5.39 | ||||||
| 2026 | TOR | AA | 24 | 4 | 4 | 0 | 30 | 8 | 81.2 | 9.81 | 2.53 | 1.21 | .303 | 62.4% | 46.9% | 17.7% | 4.85 | 4.38 | 4.04 | ||||||
| 2026 | TOR | AAA | 24 | 1 | 0 | 0 | 2 | 0 | 6.1 | 8.53 | 5.68 | 1.42 | .294 | 93.8% | 27.8% | 12.5% | 2.84 | 6.27 | 6.02 | 6.28 | |||||
| 2026 | TOR | MiLB | 24 | 5 | 4 | 0 | 33 | 8 | 91.1 | 9.66 | 2.76 | 1.18 | .299 | 65.6% | 45.4% | 16.4% | 4.63 | 6.27 | 4.47 | 4.24 | |||||
| 2026 | Steamer | ROS | 24 | 0 | 0 | 0 | 1 | 0 | 1.0 | 6.87 | 3.17 | 1.14 | .296 | 72.0% | 4.28 | 4.46 | 0.0 | ||||||||
| 2026 | OOPSY | ROS | 24 | 0 | 0 | 0 | 1 | 1 | 3.0 | 6.38 | 3.47 | 1.20 | .292 | 67.3% | 4.81 | 4.76 | 0.0 |
Preseason ProjectionsIn-Season ProjectionsMinor Leagues
| Season | Team | Level | W | L | ERA | G | GS | QS | CG | ShO | SV | HLD | BS | IP | TBF | H | R | ER | HR | BB | IBB | HBP | WP | BK | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | TOR | A+ | 0 | 0 | 2.70 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 3.1 | 14 | 2 | 1 | 1 | 0 | 1 | 0 | 1 | 0 | 0 | 3 | |
| 2026 | TOR | AA | 4 | 4 | 4.85 | 30 | 8 | 0 | 0 | 0 | 3 | 1 | 81.2 | 351 | 77 | 51 | 44 | 11 | 23 | 2 | 10 | 5 | 0 | 89 | |
| 2026 | TOR | AAA | 1 | 0 | 2.84 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 6.1 | 29 | 6 | 2 | 2 | 1 | 4 | 0 | 1 | 0 | 0 | 6 | |
| 2026 | TOR | MiLB | 5 | 4 | 4.63 | 33 | 8 | 0 | 0 | 0 | 3 | 1 | 91.1 | 394 | 85 | 54 | 47 | 12 | 28 | 2 | 12 | 5 | 0 | 98 | |
| 2026 | Steamer | ROS | 0 | 0 | 4.28 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1.0 | 4 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | ||||
| 2026 | OOPSY | ROS | 0 | 0 | 4.81 | 1 | 1 | 0 | 0 | 0 | 3.0 | 13 | 3 | 2 | 2 | 0 | 1 | 0 | 0 | 2 |
| Season | Team | Level | W | L | ERA | G | GS | QS | CG | ShO | SV | HLD | BS | IP | TBF | H | R | ER | HR | BB | IBB | HBP | WP | BK | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | TOR | A+ | 0 | 0 | 2.70 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 3.1 | 14 | 2 | 1 | 1 | 0 | 1 | 0 | 1 | 0 | 0 | 3 | |
| 2026 | TOR | AA | 4 | 4 | 4.85 | 30 | 8 | 0 | 0 | 0 | 3 | 1 | 81.2 | 351 | 77 | 51 | 44 | 11 | 23 | 2 | 10 | 5 | 0 | 89 | |
| 2026 | TOR | AAA | 1 | 0 | 2.84 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 6.1 | 29 | 6 | 2 | 2 | 1 | 4 | 0 | 1 | 0 | 0 | 6 | |
| 2026 | TOR | MiLB | 5 | 4 | 4.63 | 33 | 8 | 0 | 0 | 0 | 3 | 1 | 91.1 | 394 | 85 | 54 | 47 | 12 | 28 | 2 | 12 | 5 | 0 | 98 | |
| 2026 | Steamer | ROS | 0 | 0 | 4.28 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1.0 | 4 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | ||||
| 2026 | OOPSY | ROS | 0 | 0 | 4.81 | 1 | 1 | 0 | 0 | 0 | 3.0 | 13 | 3 | 2 | 2 | 0 | 1 | 0 | 0 | 2 |
Preseason ProjectionsIn-Season ProjectionsMinor LeaguesAverages
| Season | Team | Level | K/9 | BB/9 | K/BB | HR/9 | divider | K% | BB% | K-BB% | divider | AVG | WHIP | BABIP | LOB% | divider | ERA- | FIP- | divider | FIP |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | TOR | A+ | 8.10 | 2.70 | 3.00 | 0.00 | 21.4% | 7.1% | 14.3% | .167 | 0.90 | .222 | 75.0% | 57 | 76 | 3.72 | ||||
| 2026 | TOR | AA | 9.81 | 2.53 | 3.87 | 1.21 | 25.4% | 6.6% | 18.8% | .242 | 1.22 | .303 | 62.4% | 103 | 92 | 4.38 | ||||
| 2026 | TOR | AAA | 8.53 | 5.68 | 1.50 | 1.42 | 20.7% | 13.8% | 6.9% | .250 | 1.58 | .294 | 93.8% | 61 | 127 | 6.02 | ||||
| 2026 | TOR | MiLB | 9.66 | 2.76 | 3.50 | 1.18 | 24.9% | 7.1% | 17.8% | .240 | 1.24 | .299 | 65.6% | 98 | 94 | 4.47 | ||||
| 2026 | Steamer | ROS | 6.87 | 3.17 | 2.16 | 1.14 | 17.5% | 8.1% | 9.4% | .261 | 1.38 | .296 | 72.0% | 4.46 | ||||||
| 2026 | OOPSY | ROS | 6.38 | 3.47 | 1.84 | 1.20 | 16.5% | 9.0% | 7.5% | .263 | 1.40 | .292 | 67.3% | 4.76 |
| Season | Team | Level | K/9 | BB/9 | K/BB | HR/9 | divider | K% | BB% | K-BB% | divider | AVG | WHIP | BABIP | LOB% | divider | ERA- | FIP- | divider | FIP |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | TOR | A+ | 8.10 | 2.70 | 3.00 | 0.00 | 21.4% | 7.1% | 14.3% | .167 | 0.90 | .222 | 75.0% | 57 | 76 | 3.72 | ||||
| 2026 | TOR | AA | 9.81 | 2.53 | 3.87 | 1.21 | 25.4% | 6.6% | 18.8% | .242 | 1.22 | .303 | 62.4% | 103 | 92 | 4.38 | ||||
| 2026 | TOR | AAA | 8.53 | 5.68 | 1.50 | 1.42 | 20.7% | 13.8% | 6.9% | .250 | 1.58 | .294 | 93.8% | 61 | 127 | 6.02 | ||||
| 2026 | TOR | MiLB | 9.66 | 2.76 | 3.50 | 1.18 | 24.9% | 7.1% | 17.8% | .240 | 1.24 | .299 | 65.6% | 98 | 94 | 4.47 | ||||
| 2026 | Steamer | ROS | 6.87 | 3.17 | 2.16 | 1.14 | 17.5% | 8.1% | 9.4% | .261 | 1.38 | .296 | 72.0% | 4.46 | ||||||
| 2026 | OOPSY | ROS | 6.38 | 3.47 | 1.84 | 1.20 | 16.5% | 9.0% | 7.5% | .263 | 1.40 | .292 | 67.3% | 4.76 |
