Nathan Kirby
Free Agent (AAA)P
Age: 31
Bats/Throws: L/L
6'2" / 200
DOB: 11/23/1993
(31 years, 5 months, 8 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 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2015 | MIL | A | 21 | 0 | 1 | 0 | 5 | 2 | 12.2 | 4.97 | 4.97 | 0.00 | .357 | 60.9% | 62.5% | 0.0% | 5.68 | 4.18 | 4.65 | ||||||
| 2018 | MIL | A+ | 24 | 3 | 5 | 0 | 27 | 11 | 71.0 | 9.51 | 5.83 | 0.89 | .325 | 73.5% | 50.8% | 12.7% | 4.82 | 4.64 | 4.07 | ||||||
| 2021 | PIT | AA | 27 | 1 | 0 | 1 | 17 | 0 | 19.1 | 17.22 | 6.98 | 0.47 | .429 | 52.0% | 34.2% | 5.3% | 6.52 | 3.00 | 3.87 | ||||||
| 2021 | MIL | AA | 27 | 0 | 1 | 0 | 17 | 0 | 18.2 | 9.16 | 6.27 | 0.48 | .234 | 74.2% | 48.9% | 10.0% | 1.93 | 4.47 | 4.64 | ||||||
| 2021 | --- | MiLB | 27 | 1 | 1 | 1 | 34 | 0 | 38.0 | 13.26 | 6.63 | 0.47 | .326 | 61.5% | 42.2% | 6.9% | 4.26 | 3.72 | 4.25 | ||||||
| 2022 | PIT | AAA | 28 | 0 | 1 | 0 | 15 | 4 | 23.0 | 7.04 | 8.61 | 0.39 | .304 | 78.0% | 57.4% | 7.1% | 2.74 | 5.51 | 5.95 | ||||||
| 2025 | Steamer | PROJ | 31 | 0 | 0 | 0 | 0 | 0 | 1.0 | 7.05 | 4.10 | 1.16 | .298 | 71.7% | 44.7% | 4.57 | 4.77 | 4.74 | 0.0 | ||||||
| 2025 | Steamer | ROS | 0 | 0 | 0 | 0 | 0 | 1.0 | 6.96 | 4.30 | 1.12 | .298 | 71.8% | 4.58 | 4.71 | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2015 | MIL | A | 21 | 0 | 1 | 0 | 5 | 2 | 12.2 | 4.97 | 4.97 | 0.00 | .357 | 60.9% | 62.5% | 0.0% | 5.68 | 4.18 | 4.65 | ||||||
| 2018 | MIL | A+ | 24 | 3 | 5 | 0 | 27 | 11 | 71.0 | 9.51 | 5.83 | 0.89 | .325 | 73.5% | 50.8% | 12.7% | 4.82 | 4.64 | 4.07 | ||||||
| 2021 | PIT | AA | 27 | 1 | 0 | 1 | 17 | 0 | 19.1 | 17.22 | 6.98 | 0.47 | .429 | 52.0% | 34.2% | 5.3% | 6.52 | 3.00 | 3.87 | ||||||
| 2021 | MIL | AA | 27 | 0 | 1 | 0 | 17 | 0 | 18.2 | 9.16 | 6.27 | 0.48 | .234 | 74.2% | 48.9% | 10.0% | 1.93 | 4.47 | 4.64 | ||||||
| 2021 | --- | MiLB | 27 | 1 | 1 | 1 | 34 | 0 | 38.0 | 13.26 | 6.63 | 0.47 | .326 | 61.5% | 42.2% | 6.9% | 4.26 | 3.72 | 4.25 | ||||||
| 2022 | PIT | AAA | 28 | 0 | 1 | 0 | 15 | 4 | 23.0 | 7.04 | 8.61 | 0.39 | .304 | 78.0% | 57.4% | 7.1% | 2.74 | 5.51 | 5.95 | ||||||
| 2025 | Steamer | PROJ | 31 | 0 | 0 | 0 | 0 | 0 | 1.0 | 7.05 | 4.10 | 1.16 | .298 | 71.7% | 44.7% | 4.57 | 4.77 | 4.74 | 0.0 | ||||||
| 2025 | Steamer | ROS | 0 | 0 | 0 | 0 | 0 | 1.0 | 6.96 | 4.30 | 1.12 | .298 | 71.8% | 4.58 | 4.71 | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2015 | MIL | A | 0 | 1 | 5.68 | 5 | 2 | 0 | 0 | 0 | 0 | 0 | 12.2 | 57 | 15 | 9 | 8 | 0 | 7 | 0 | 1 | 2 | 0 | 7 | |
| 2018 | MIL | A+ | 3 | 5 | 4.82 | 27 | 11 | 0 | 0 | 0 | 0 | 1 | 71.0 | 326 | 70 | 39 | 38 | 7 | 46 | 0 | 4 | 11 | 0 | 75 | |
| 2021 | PIT | AA | 1 | 0 | 6.52 | 17 | 0 | 0 | 0 | 1 | 4 | 0 | 19.1 | 97 | 19 | 18 | 14 | 1 | 15 | 0 | 2 | 1 | 0 | 37 | |
| 2021 | MIL | AA | 0 | 1 | 1.93 | 17 | 0 | 0 | 0 | 0 | 4 | 1 | 18.2 | 82 | 12 | 8 | 4 | 1 | 13 | 1 | 2 | 1 | 1 | 19 | |
| 2021 | --- | MiLB | 1 | 1 | 4.26 | 34 | 0 | 0 | 0 | 1 | 8 | 1 | 38.0 | 179 | 31 | 26 | 18 | 2 | 28 | 1 | 4 | 2 | 1 | 56 | |
| 2022 | PIT | AAA | 0 | 1 | 2.74 | 15 | 4 | 0 | 0 | 0 | 0 | 1 | 23.0 | 111 | 22 | 11 | 7 | 1 | 22 | 0 | 1 | 10 | 0 | 18 | |
| 2025 | Steamer | PROJ | 0 | 0 | 4.57 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1.0 | 4 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | |||
| 2025 | Steamer | ROS | 0 | 0 | 4.58 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1.0 | 4 | 1 | 1 | 1 | 0 | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2015 | MIL | A | 0 | 1 | 5.68 | 5 | 2 | 0 | 0 | 0 | 0 | 0 | 12.2 | 57 | 15 | 9 | 8 | 0 | 7 | 0 | 1 | 2 | 0 | 7 | |
| 2018 | MIL | A+ | 3 | 5 | 4.82 | 27 | 11 | 0 | 0 | 0 | 0 | 1 | 71.0 | 326 | 70 | 39 | 38 | 7 | 46 | 0 | 4 | 11 | 0 | 75 | |
| 2021 | PIT | AA | 1 | 0 | 6.52 | 17 | 0 | 0 | 0 | 1 | 4 | 0 | 19.1 | 97 | 19 | 18 | 14 | 1 | 15 | 0 | 2 | 1 | 0 | 37 | |
| 2021 | MIL | AA | 0 | 1 | 1.93 | 17 | 0 | 0 | 0 | 0 | 4 | 1 | 18.2 | 82 | 12 | 8 | 4 | 1 | 13 | 1 | 2 | 1 | 1 | 19 | |
| 2021 | --- | MiLB | 1 | 1 | 4.26 | 34 | 0 | 0 | 0 | 1 | 8 | 1 | 38.0 | 179 | 31 | 26 | 18 | 2 | 28 | 1 | 4 | 2 | 1 | 56 | |
| 2022 | PIT | AAA | 0 | 1 | 2.74 | 15 | 4 | 0 | 0 | 0 | 0 | 1 | 23.0 | 111 | 22 | 11 | 7 | 1 | 22 | 0 | 1 | 10 | 0 | 18 | |
| 2025 | Steamer | PROJ | 0 | 0 | 4.57 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1.0 | 4 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | |||
| 2025 | Steamer | ROS | 0 | 0 | 4.58 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1.0 | 4 | 1 | 1 | 1 | 0 | 0 | 0 | 1 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2015 | MIL | A | 4.97 | 4.97 | 1.00 | 0.00 | 12.3% | 12.3% | 0.0% | .306 | 1.74 | .357 | 60.9% | 154 | 115 | 4.18 | ||||
| 2018 | MIL | A+ | 9.51 | 5.83 | 1.63 | 0.89 | 23.0% | 14.1% | 8.9% | .254 | 1.63 | .325 | 73.5% | 122 | 118 | 4.64 | ||||
| 2021 | PIT | AA | 17.22 | 6.98 | 2.47 | 0.47 | 38.1% | 15.5% | 22.7% | .238 | 1.76 | .429 | 52.0% | 151 | 69 | 3.00 | ||||
| 2021 | MIL | AA | 9.16 | 6.27 | 1.46 | 0.48 | 23.2% | 15.9% | 7.3% | .179 | 1.34 | .234 | 74.2% | 47 | 104 | 4.47 | ||||
| 2021 | --- | MiLB | 13.26 | 6.63 | 2.00 | 0.47 | 31.3% | 15.6% | 15.6% | .211 | 1.55 | .326 | 61.5% | 99 | 87 | 3.72 | ||||
| 2022 | PIT | AAA | 7.04 | 8.61 | 0.82 | 0.39 | 16.2% | 19.8% | -3.6% | .250 | 1.91 | .304 | 78.0% | 60 | 121 | 5.51 | ||||
| 2025 | Steamer | PROJ | 7.05 | 4.10 | 1.72 | 1.16 | 17.7% | 10.3% | 7.4% | .262 | 1.48 | .298 | 71.7% | 4.77 | ||||||
| 2025 | Steamer | ROS | 6.96 | 4.30 | 1.62 | 1.12 | 17.4% | 10.8% | 6.7% | .262 | 1.50 | .298 | 71.8% | 4.71 |
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2015 | MIL | A | 4.97 | 4.97 | 1.00 | 0.00 | 12.3% | 12.3% | 0.0% | .306 | 1.74 | .357 | 60.9% | 154 | 115 | 4.18 | ||||
| 2018 | MIL | A+ | 9.51 | 5.83 | 1.63 | 0.89 | 23.0% | 14.1% | 8.9% | .254 | 1.63 | .325 | 73.5% | 122 | 118 | 4.64 | ||||
| 2021 | PIT | AA | 17.22 | 6.98 | 2.47 | 0.47 | 38.1% | 15.5% | 22.7% | .238 | 1.76 | .429 | 52.0% | 151 | 69 | 3.00 | ||||
| 2021 | MIL | AA | 9.16 | 6.27 | 1.46 | 0.48 | 23.2% | 15.9% | 7.3% | .179 | 1.34 | .234 | 74.2% | 47 | 104 | 4.47 | ||||
| 2021 | --- | MiLB | 13.26 | 6.63 | 2.00 | 0.47 | 31.3% | 15.6% | 15.6% | .211 | 1.55 | .326 | 61.5% | 99 | 87 | 3.72 | ||||
| 2022 | PIT | AAA | 7.04 | 8.61 | 0.82 | 0.39 | 16.2% | 19.8% | -3.6% | .250 | 1.91 | .304 | 78.0% | 60 | 121 | 5.51 | ||||
| 2025 | Steamer | PROJ | 7.05 | 4.10 | 1.72 | 1.16 | 17.7% | 10.3% | 7.4% | .262 | 1.48 | .298 | 71.7% | 4.77 | ||||||
| 2025 | Steamer | ROS | 6.96 | 4.30 | 1.62 | 1.12 | 17.4% | 10.8% | 6.7% | .262 | 1.50 | .298 | 71.8% | 4.71 |
