Kelvin Rosario
Arizona Diamondbacks (CPX)P
Age: 18
Bats/Throws: L/L
6'2" / 140
DOB: 8/28/2006
(18 years, 9 months, 9 days)
P
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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2023 | ARI | DSL | 16 | 0 | 1 | 0 | 5 | 3 | 13.2 | 9.88 | 3.95 | 0.00 | .250 | 53.3% | 41.9% | 0.0% | 4.61 | 3.32 | 4.17 | ||||||
| 2023 | ARI | DSL | 16 | 0 | 2 | 0 | 7 | 5 | 18.2 | 8.68 | 5.30 | 0.48 | .315 | 61.6% | 33.3% | 3.8% | 5.30 | 4.51 | 4.83 | ||||||
| 2023 | ARI | MiLB | 16 | 0 | 3 | 0 | 12 | 8 | 32.1 | 9.19 | 4.73 | 0.28 | .291 | 58.7% | 36.5% | 2.4% | 5.01 | 4.01 | 4.55 | ||||||
| 2024 | ARI | DSL | 17 | 4 | 2 | 0 | 10 | 5 | 39.1 | 9.38 | 3.43 | 0.92 | .294 | 82.6% | 51.5% | 13.3% | 2.97 | 4.74 | 3.85 | ||||||
| 2025 | Steamer | PROJ | 18 | 0 | 0 | 0 | 0 | 0 | 1.0 | 4.52 | 7.18 | 1.49 | .297 | 68.2% | 41.0% | 6.64 | 6.86 | 6.76 | 0.0 | ||||||
| 2025 | ARI | CPX | 18 | 3 | 0 | 0 | 4 | 1 | 10.1 | 9.58 | 8.71 | 0.87 | .296 | 75.3% | 52.0% | 20.0% | 3.48 | 6.76 | 5.93 | ||||||
| 2025 | Steamer | ROS | 0 | 0 | 0 | 0 | 0 | 1.0 | 4.55 | 7.96 | 1.37 | .297 | 68.8% | 6.62 | 6.84 | 0.0 | |||||||||
| 2025 | OOPSY | ROS | 18 | 0 | 0 | 0 | 1 | 1 | 2.5 | 6.34 | 5.68 | 1.37 | .305 | 69.4% | 5.82 | 5.81 | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2023 | ARI | DSL | 16 | 0 | 1 | 0 | 5 | 3 | 13.2 | 9.88 | 3.95 | 0.00 | .250 | 53.3% | 41.9% | 0.0% | 4.61 | 3.32 | 4.17 | ||||||
| 2023 | ARI | DSL | 16 | 0 | 2 | 0 | 7 | 5 | 18.2 | 8.68 | 5.30 | 0.48 | .315 | 61.6% | 33.3% | 3.8% | 5.30 | 4.51 | 4.83 | ||||||
| 2023 | ARI | MiLB | 16 | 0 | 3 | 0 | 12 | 8 | 32.1 | 9.19 | 4.73 | 0.28 | .291 | 58.7% | 36.5% | 2.4% | 5.01 | 4.01 | 4.55 | ||||||
| 2024 | ARI | DSL | 17 | 4 | 2 | 0 | 10 | 5 | 39.1 | 9.38 | 3.43 | 0.92 | .294 | 82.6% | 51.5% | 13.3% | 2.97 | 4.74 | 3.85 | ||||||
| 2025 | Steamer | PROJ | 18 | 0 | 0 | 0 | 0 | 0 | 1.0 | 4.52 | 7.18 | 1.49 | .297 | 68.2% | 41.0% | 6.64 | 6.86 | 6.76 | 0.0 | ||||||
| 2025 | ARI | CPX | 18 | 3 | 0 | 0 | 4 | 1 | 10.1 | 9.58 | 8.71 | 0.87 | .296 | 75.3% | 52.0% | 20.0% | 3.48 | 6.76 | 5.93 | ||||||
| 2025 | Steamer | ROS | 0 | 0 | 0 | 0 | 0 | 1.0 | 4.55 | 7.96 | 1.37 | .297 | 68.8% | 6.62 | 6.84 | 0.0 | |||||||||
| 2025 | OOPSY | ROS | 18 | 0 | 0 | 0 | 1 | 1 | 2.5 | 6.34 | 5.68 | 1.37 | .305 | 69.4% | 5.82 | 5.81 | 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 | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2023 | ARI | DSL | 0 | 1 | 4.61 | 5 | 3 | 0 | 0 | 0 | 1 | 0 | 13.2 | 54 | 8 | 7 | 7 | 0 | 6 | 0 | 1 | 4 | 0 | 15 | |
| 2023 | ARI | DSL | 0 | 2 | 5.30 | 7 | 5 | 0 | 0 | 0 | 1 | 0 | 18.2 | 84 | 18 | 12 | 11 | 1 | 11 | 0 | 0 | 2 | 0 | 18 | |
| 2023 | ARI | MiLB | 0 | 3 | 5.01 | 12 | 8 | 0 | 0 | 0 | 2 | 0 | 32.1 | 138 | 26 | 19 | 18 | 1 | 17 | 0 | 1 | 6 | 0 | 33 | |
| 2024 | ARI | DSL | 4 | 2 | 2.97 | 10 | 5 | 0 | 0 | 0 | 0 | 0 | 39.1 | 167 | 34 | 14 | 13 | 4 | 15 | 0 | 5 | 8 | 1 | 41 | |
| 2025 | Steamer | PROJ | 0 | 0 | 6.64 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1.0 | 5 | 1 | 1 | 1 | 0 | 1 | 0 | 0 | 1 | |||
| 2025 | ARI | CPX | 3 | 0 | 3.48 | 4 | 1 | 0 | 0 | 0 | 0 | 0 | 10.1 | 50 | 9 | 6 | 4 | 1 | 10 | 0 | 1 | 0 | 0 | 11 | |
| 2025 | Steamer | ROS | 0 | 0 | 6.62 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1.0 | 5 | 1 | 1 | 1 | 0 | 1 | 0 | 1 | ||||
| 2025 | OOPSY | ROS | 0 | 0 | 5.82 | 1 | 1 | 0 | 0 | 0 | 2.5 | 12 | 3 | 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 | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2023 | ARI | DSL | 0 | 1 | 4.61 | 5 | 3 | 0 | 0 | 0 | 1 | 0 | 13.2 | 54 | 8 | 7 | 7 | 0 | 6 | 0 | 1 | 4 | 0 | 15 | |
| 2023 | ARI | DSL | 0 | 2 | 5.30 | 7 | 5 | 0 | 0 | 0 | 1 | 0 | 18.2 | 84 | 18 | 12 | 11 | 1 | 11 | 0 | 0 | 2 | 0 | 18 | |
| 2023 | ARI | MiLB | 0 | 3 | 5.01 | 12 | 8 | 0 | 0 | 0 | 2 | 0 | 32.1 | 138 | 26 | 19 | 18 | 1 | 17 | 0 | 1 | 6 | 0 | 33 | |
| 2024 | ARI | DSL | 4 | 2 | 2.97 | 10 | 5 | 0 | 0 | 0 | 0 | 0 | 39.1 | 167 | 34 | 14 | 13 | 4 | 15 | 0 | 5 | 8 | 1 | 41 | |
| 2025 | Steamer | PROJ | 0 | 0 | 6.64 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1.0 | 5 | 1 | 1 | 1 | 0 | 1 | 0 | 0 | 1 | |||
| 2025 | ARI | CPX | 3 | 0 | 3.48 | 4 | 1 | 0 | 0 | 0 | 0 | 0 | 10.1 | 50 | 9 | 6 | 4 | 1 | 10 | 0 | 1 | 0 | 0 | 11 | |
| 2025 | Steamer | ROS | 0 | 0 | 6.62 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1.0 | 5 | 1 | 1 | 1 | 0 | 1 | 0 | 1 | ||||
| 2025 | OOPSY | ROS | 0 | 0 | 5.82 | 1 | 1 | 0 | 0 | 0 | 2.5 | 12 | 3 | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2023 | ARI | DSL | 9.88 | 3.95 | 2.50 | 0.00 | 27.8% | 11.1% | 16.7% | .170 | 1.02 | .250 | 53.3% | 93 | 69 | 3.32 | ||||
| 2023 | ARI | DSL | 8.68 | 5.30 | 1.64 | 0.48 | 21.4% | 13.1% | 8.3% | .247 | 1.55 | .315 | 61.6% | 113 | 96 | 4.51 | ||||
| 2023 | ARI | MiLB | 9.19 | 4.73 | 1.94 | 0.28 | 23.9% | 12.3% | 11.6% | .217 | 1.33 | .291 | 58.7% | 104 | 85 | 4.01 | ||||
| 2024 | ARI | DSL | 9.38 | 3.43 | 2.73 | 0.92 | 24.6% | 9.0% | 15.6% | .231 | 1.25 | .294 | 82.6% | 58 | 94 | 4.74 | ||||
| 2025 | Steamer | PROJ | 4.52 | 7.18 | 0.63 | 1.49 | 10.3% | 16.3% | -6.0% | .289 | 1.96 | .297 | 68.2% | 6.86 | ||||||
| 2025 | ARI | CPX | 9.58 | 8.71 | 1.10 | 0.87 | 22.0% | 20.0% | 2.0% | .231 | 1.84 | .296 | 75.3% | 69 | 134 | 6.76 | ||||
| 2025 | Steamer | ROS | 4.55 | 7.96 | 0.57 | 1.37 | 10.2% | 17.9% | -7.7% | .286 | 2.03 | .297 | 68.8% | 6.84 | ||||||
| 2025 | OOPSY | ROS | 6.34 | 5.68 | 1.12 | 1.37 | 14.2% | 12.7% | 1.5% | .280 | 1.82 | .305 | 69.4% | 5.81 |
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2023 | ARI | DSL | 9.88 | 3.95 | 2.50 | 0.00 | 27.8% | 11.1% | 16.7% | .170 | 1.02 | .250 | 53.3% | 93 | 69 | 3.32 | ||||
| 2023 | ARI | DSL | 8.68 | 5.30 | 1.64 | 0.48 | 21.4% | 13.1% | 8.3% | .247 | 1.55 | .315 | 61.6% | 113 | 96 | 4.51 | ||||
| 2023 | ARI | MiLB | 9.19 | 4.73 | 1.94 | 0.28 | 23.9% | 12.3% | 11.6% | .217 | 1.33 | .291 | 58.7% | 104 | 85 | 4.01 | ||||
| 2024 | ARI | DSL | 9.38 | 3.43 | 2.73 | 0.92 | 24.6% | 9.0% | 15.6% | .231 | 1.25 | .294 | 82.6% | 58 | 94 | 4.74 | ||||
| 2025 | Steamer | PROJ | 4.52 | 7.18 | 0.63 | 1.49 | 10.3% | 16.3% | -6.0% | .289 | 1.96 | .297 | 68.2% | 6.86 | ||||||
| 2025 | ARI | CPX | 9.58 | 8.71 | 1.10 | 0.87 | 22.0% | 20.0% | 2.0% | .231 | 1.84 | .296 | 75.3% | 69 | 134 | 6.76 | ||||
| 2025 | Steamer | ROS | 4.55 | 7.96 | 0.57 | 1.37 | 10.2% | 17.9% | -7.7% | .286 | 2.03 | .297 | 68.8% | 6.84 | ||||||
| 2025 | OOPSY | ROS | 6.34 | 5.68 | 1.12 | 1.37 | 14.2% | 12.7% | 1.5% | .280 | 1.82 | .305 | 69.4% | 5.81 |
