Players · D · Pitcher · 2021
Danny Duffy
- Age
- 33
- B/T
- L/L
- Height
- 6' 3"
- Weight
- 205 lb
- Born
- December 21, 1988 in Goleta, CA, United States
- MLB debut
- May 18, 2011
- dbWAR
- 10.7 11 season(s)
- IP
- 61.0
- ERA
- 2.51
- FIP
- 3.40
- K/9
- 9.6
- FIP−
- 80 100 = avg
Danny Duffy was a starting pitcher for the Kansas City Royals. In 2021 he struck out 65 batters over 61.0 innings across 13 appearances, 12 of them starts, going 4-3. His ERA of 2.51 was 41.2% lower than the league average of 4.27 — the second best on his team, and 51st of 567 among MLB pitchers with 20+ innings. Stripping out defence, his 3.40 FIP suggests that his ERA had some help behind him. He missed bats on 29.1% of swings (14.2% of every pitch he threw), walked 8.7% of the batters he faced and struck out 25.8%. His 1.4 dbWAR is built from that FIP rather than runs allowed, so it credits him for what he controls and not for the defence behind him.
League context
Percentile among qualified pitchers, 2021.
WAR by season
Pitching
Standard and advanced, by season.
| Trend | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021 | KC | 13 | 12 | 61.0 | 4 | 3 | 0 | 52 | 17 | 65 | 22 | 2.51 | 3.40 | 1.21 | 9.6 | 3.2 | 59 | 80 | 1.4 | |
| 2020 | KC | 12 | 11 | 56.1 | 4 | 4 | 0 | 53 | 31 | 57 | 22 | 4.95 | 4.75 | 1.33 | 9.1 | 3.5 | 111 | 107 | 0.5 | |
| 2019 | KC | 23 | 23 | 130.2 | 7 | 6 | 0 | 125 | 63 | 115 | 46 | 4.34 | 4.78 | 1.31 | 7.9 | 3.2 | 96 | 106 | 1.3 | |
| 2018 | KC | 28 | 28 | 155.0 | 8 | 12 | 0 | 161 | 84 | 141 | 70 | 4.88 | 4.70 | 1.49 | 8.2 | 4.1 | 118 | 113 | 0.9 | |
| 2017 | KC | 24 | 24 | 146.1 | 9 | 10 | 0 | 143 | 62 | 130 | 41 | 3.81 | 3.46 | 1.26 | 8.0 | 2.5 | 87 | 79 | 3.2 | |
| 2016 | KC | 42 | 26 | 179.2 | 12 | 3 | 0 | 163 | 70 | 188 | 42 | 3.51 | 3.83 | 1.14 | 9.4 | 2.1 | 84 | 91 | 2.7 | |
| 2015 | KC | 30 | 24 | 136.2 | 7 | 8 | 1 | 137 | 62 | 102 | 53 | 4.08 | 4.43 | 1.39 | 6.7 | 3.5 | 103 | 112 | 0.7 |
Batting
Standard and advanced, by season.
Platoon splits
How left- and right-handed hitters fare against him.
| Split | PA | AB | H | HR | BB | SO | AVG | OBP | SLG | wOBA | K% |
|---|---|---|---|---|---|---|---|---|---|---|---|
| vs LHB | 49 | 46 | 10 | 3 | 3 | 16 | .217 | .265 | .413 | .291 | 32.7% |
| vs RHB | 203 | 184 | 42 | 3 | 19 | 49 | .228 | .300 | .342 | .285 | 24.1% |
Pitch sequencing
What Danny Duffy throws in each count, and what he follows each pitch with. Select any cell for the breakdown.
Select a count to see exactly what Danny Duffy throws in it.
Pitch arsenal
What he throws, how hard, how often it misses, and what hitters do with it.
| Four-Seam Fastball | 432 | 93.7 | 2,272 | 53.2% | 26.2% | 104 | .212 | .609 | |
| Slider | 184 | 83.4 | 2,501 | 41.8% | 39.3% | 48 | .188 | .521 | |
| Changeup | 155 | 85.2 | 2,292 | 40.0% | 37.3% | 36 | .194 | .577 | |
| Sinker | 129 | 93.6 | 2,215 | 48.1% | 14.0% | 23 | .391 | 1.213 | |
| Curveball | 109 | 77.3 | 2,483 | 41.3% | 31.0% | 19 | .263 | .579 |
Head to head
Put Danny Duffy beside up to three others.
Similar players
Nearest 2021 seasons by command, run prevention and role, on rate statistics rather than totals.
wOBA uses linear weights measured from this season's own play-by-play rather than published constants, and wRC+ is park-adjusted against that same league. dbWAR is our own open implementation — not fWAR or bWAR — and the full derivation, including its simplifications, is on the methodology page.