Zack Kelly
P | Bats/Throws: R/R | 6' 3" 231LBS | Age: 29
W L ERA G GS SV IP SO WHIP
2022 1 0 3.95 13 0 0 13.2 11 1.32
2023 0 0 3.86 8 0 0 9.1 6 1.61
2024 6 3 3.97 49 3 0 56.2 61 1.25
3 Seasons 7 3 3.95 70 3 0 79.2 78 1.31
G W-L ERA IP SO WHIP
2022 13 1-0 3.95 13.2 11 1.32
2023 8 0-0 3.86 9.1 6 1.61
2024 49 6-3 3.97 56.2 61 1.25
3 Seasons 70 7-3 3.95 79.2 78 1.31
MLB Percentile Rankings
Movement Profile (Induced Break)
?

Statcast Statistics

Season Age Pitches Batted
Balls
Barrels Barrel % Barrel/PA Exit
Velocity
Max EV Launch
Angle
LA Sweet-
Spot %
XBA XSLG WOBA XWOBA XWOBACON HardHit% K% BB% ERA xERA
2022 27 222 44 3 6.8 5.1 85.0 109.2 12.6 29.5 .199 .343 .316 .261 .287 25.0 18.6 6.8 3.95 2.79
2023 28 181 26 2 7.7 4.7 89.5 109.9 8.7 30.8 .225 .381 .357 .362 .315 46.2 14.0 18.6 3.86 5.74
2024 29 957 151 15 9.9 6.2 87.2 114.4 12.0 35.1 .232 .422 .300 .322 .388 31.1 25.3 11.2 3.97 4.28
Player 1360 221 20 9.0 5.8 87.0 114.4 11.7 33.5 .225 .404 .310 .316 .360 31.7 22.7 11.4
MLB 7.0 4.8 88.5 122.4 12.3 33.2 .245 .406 .316 .315 .369 36.5 22.2 8.4
! Note: All figures in this table cover the period 2015-present.

Statcast Pitch Arsenal

Kelly relies on 4 pitches.
Four Seamer
(29.9%) ,
Sweeper
(27.2%) ,
Cutter
(21.9%) ,
Changeup
(20.9%) ,


  •   
  •   
  •   

+ If Available Pitches Click to Video.


  •   
  •   
  •   
  •   
  •   
  •   
  •   

Pitch Tracking



Batted Ball Profile

Season GB % FB % LD % PU % Pull % Straight % Oppo % Weak % Topped % Under % Flare/Burner % Solid % Barrel % Barrel/PA
2022 45.5 31.8 13.6 9.1 36.4 40.9 22.7 9.1 31.8 31.8 13.6 4.5 6.8 5.1
2023 53.8 26.9 19.2 0.0 34.6 42.3 23.1 3.8 38.5 30.8 19.2 0.0 7.7 4.7
2024 47.7 24.5 20.5 7.3 38.4 39.7 21.9 6.0 36.4 21.2 21.9 4.6 9.9 6.2
Player 48.0 26.2 19.0 6.8 37.6 40.3 22.2 6.3 35.7 24.4 19.9 4.1 9.0 5.8
MLB 44.4 23.8 24.7 7.1 37.2 37.5 25.2 3.9 32.6 24.8 24.4 5.9 7.0 4.8
! Note: All figures in this table cover the period 2015-present.

Pitch Movement


How this works: This section shows two different ways to evaluate pitch movement. On the left, “Total Movement” shows the real-world movement of a pitch, including the forces of gravity, which affects every pitch thrown. Since gravity requires time, and slower pitches aren't 'better' just because they have more time to move, a pitch's movement is compared to other pitches of the same pitch type, within +/- 2 MPH and +/- 0.5 feet of extension/release. On the right, Induced Movement (or IVB) is reported without gravity, and attempts to isolate movement created by the pitcher's ability to spin and manipulate the ball.
Total Movement (in inches, w/ gravity)Induced Movement (in inches, w/o gravity)
YearPitchTeamHand#MPHVertical
Drop
vs.
Comparable
Horizontal
Break
vs.
Comparable
Vertical
Break
vs. AvgHorizontal
Break
vs. Avg
2024 Cutter BOS R 209 91.1 26.2 -1.9 2.2GLV 0.1 6.8 -1.5 2.2GLV -0.3
2024 4-Seam Fastball BOS R 286 96.5 14.6 -0.8 9.7ARM 1.8 14.9 -0.9 9.7ARM 2.2
2024 Changeup BOS R 200 83.6 38.9 3.8 18.0ARM 3.5 0.5 4.4 18.0ARM 3.8
2024 Sweeper BOS R 260 82.2 38.1 -0.2 17.6GLV 3.6 2.5 -0.9 17.6GLV 3.3
2023 Slider BOS R 33 85.8 34.0 -1.5 5.5GLV 0.8 3.3 -1.9 5.5GLV 0.2
2023 Changeup BOS R 63 82.3 35.5 -0.5 19.5ARM 5.0 5.5 -0.1 19.5ARM 5.1
2023 4-Seam Fastball BOS R 83 94.5 15.4 -0.3 11.7ARM 4.1 15.6 -0.2 11.7ARM 4.3
2022 4-Seam Fastball BOS R 105 94.6 15.0 -0.4 11.2ARM 3.5 15.8 -0.4 11.2ARM 3.9
2022 Slider BOS R 30 85.7 35.6 0.2 6.6GLV 1.6 1.7 0.1 6.6GLV 0.9
2022 Changeup BOS R 87 82.0 33.9 -1.2 17.6ARM 2.9 7.1 -1.2 17.6ARM 3.4
! Note: Years are in reverse order.
+ View Complete Pitch Movement Leaderboard

Run Values by Pitch Type

Year Pitch Type Team RV/100 Run Value Pitches % PA BA SLG wOBA Whiff% K% PutAway % xBA xSLG xwOBA Hard Hit %
2024 4-Seam Fastball -0.9 -3 286 29.9 81 .250 .344 .362 23.0 24.7 17.9 .284 .495 .408 38.6
2024 Sweeper 1.7 4 260 27.2 61 .138 .224 .197 34.4 32.8 21.3 .128 .199 .167 15.8
2024 Cutter 0.0 0 209 21.8 52 .277 .574 .390 21.9 11.5 22.2 .300 .541 .389 46.3
2024 Changeup -0.8 -2 200 20.9 44 .163 .465 .288 32.6 34.1 20.5 .219 .485 .302 17.9
2023 4-Seam Fastball -0.1 0 84 46.4 21 .286 .429 .438 14.7 9.5 10.5 .273 .500 .450 66.7
2023 Changeup -1.3 -1 63 34.8 16 .167 .333 .331 34.6 18.8 11.1 .124 .247 .290 11.1
2023 Slider 2.9 1 34 18.8 6 .167 .333 .208 21.4 16.7 16.7 .315 .369 .298 60.0
2022 4-Seam Fastball 1.6 2 105 47.3 27 .167 .208 .240 11.6 14.8 17.4 .169 .191 .195 23.8
2022 Changeup -2.5 -2 87 39.2 23 .333 .524 .398 20.5 26.1 19.4 .191 .360 .276 20.0
2022 Slider -5.3 -2 30 13.5 9 .333 .778 .461 26.7 11.1 33.3 .291 .691 .416 37.5
! Note: Years are in reverse order.
! Note: To better align with other values, positive numbers (red) are good, and negative numbers (blue) are poor.
+ View Complete Run Value Leaderboard

Spin Direction

Year Pitch Type Pitches MPH Active Spin % Total Movement (In.) Spin-Based Observed Deviation
2024 Changeup 200 83.6 94 18.9 3:00 3:15 -15
2024 Cutter 208 91.1 48 6.5 12:00 11:15 45
2024 4-Seam Fastball 286 96.5 95 17.6 1:15 1:15 0
2024 Sweeper 258 82.2 57 18.8 8:15 9:00 -45
2023 Changeup 63 82.3 91 20.8 3:00 2:45 15
2023 4-Seam Fastball 77 94.6 96 19.3 1:15 1:15 0
2023 Slider 31 85.7 38 6.6 10:15 9:45 30
2022 Changeup 86 81.9 85 19.3 3:00 2:30 30
2022 4-Seam Fastball 105 94.6 98 19.2 1:15 1:15 0
2022 Slider 30 85.7 34 7.4 10:15 9:15 60
! Note: This table is showing data from the PITCHER perspective.
+ View Complete Spin Direction Leaderboard

Pitcher Arm Angle

! Note: Data is available from 2020 through the present.
+ View Complete Arm Angle Leaderboard

Swing/Take

Runs
Year Team PA Pitches Heart Shadow Chase Waste All
2022 59 222 1 0 -3 -1 -2
2023 43 181 4 4 -5 -2 0
2024 238 955 1 11 -8 -4 0
+ View Complete Swing/Take Leaderboard

Plate Discipline

Season Pitches Zone % Zone Swing % Zone Contact % Chase % Chase Contact % Edge % 1st Pitch Strike % Swing % Whiff % Meatball % Meatball Swing %
2022 222 53.6 68.1 87.7 20.4 61.9 36.5 64.4 45.9 17.6 9.9 72.7
2023 181 42.5 61.0 76.6 26.0 74.1 42.5 46.5 40.9 23.0 7.2 61.5
2024 957 49.2 66.9 78.7 26.7 54.6 43.6 67.8 46.5 28.1 7.4 81.7
Player 1,360 49.0 66.4 80.1 25.7 58.4 42.3 64.5 45.7 25.8 7.8 77.4
MLB 48.7 67.0 82.0 28.5 57.8 42.6 61.0 47.2 24.9 7.3 76.3
! Note: All figures in this table cover the period 2015-present.

Percentile Rankings

Year xwOBA /
xERA
xBA xSLG xISO xOBP Brl Brl% EV Hard
Hit%
K% BB% Whiff% Chase
Rate
FB
Velo
FB
Spin
CB
Spin
Extension
2022 63 29 79
2023 58 29 88
2024 34 64 29 13 35 54 12 87 95 70 13 71 26 87 30 92
+ View Complete Percentile Rankings Leaderboard

Expected Home Runs

Adjusted

Year Team Avg HR Trot Actual HR xHR HR-xHR Doubters Mostly Gone No Doubters No Doubter %
2022 22.8 2 1.4 1 3 1 0 0.0
2023 -- 0 1.0 -1 2 1 0 --
2024 24.6 10 9.4 1 2 6 5 50.0
Player 24.3 12 11.8 0 7 8 5 41.7
Note: xHR tells how many of this pitcher's home runs allowed would have been out of other stadiums. The "Adjusted" view here accounts for different wall heights, distances and environmental effects using Statcast Park Factor data.
+ View Standard Expected Home Runs

Expected Home Runs by Park

Adjusted

Year HR
2022 2 2 2 0 1 2 2 1 0 1 1 2 1 1 1 1 1 1 2 1 2 3 2 3 1 1 1 2 3 1 1
2023 0 1 0 2 1 1 1 1 0 1 0 1 2 1 1 1 1 1 1 2 1 0 2 1 1 1 0 1 1 1 1
2024 10 10 8 11 9 9 11 10 8 8 9 9 12 9 8 10 8 8 11 10 11 9 11 11 9 8 10 9 11 8 8
Player 12 13 10 13 11 12 14 12 8 10 10 12 15 11 10 12 10 10 14 13 14 12 15 15 11 10 11 12 15 10 10
Note: xHR tells how many of this pitcher's home runs allowed would have been out of other stadiums. The "Adjusted" view here accounts for different wall heights, distances and environmental effects using Statcast Park Factor data.
+ View Standard Expected Home Runs By Park
+ View Complete Expected Home Runs Leaderboard

Year to Year Changes

Metric 2022 2023 +/-   2024 +/-  
Fastball Velocity 94.6 94.5 -0.1 94.2 -0.3
Offspeed Velocity 82.0 82.3 0.3 83.6 1.3
Breaking Velocity 85.7 85.9 0.2 82.2 -3.7
Exit Velocity 85.0 89.5 4.5 87.2 -2.3
Launch Angle 12.6 8.7 -3.9 12.0 3.3
Barrel % 6.8 7.7 0.9 9.9 2.2
Hard Hit % 25.0 46.2 21.2 31.1 -15.1
LA Sweet-Spot % 29.5 30.8 1.3 35.1 4.3
xBA .199 .225 0.026 .232 0.007
BA .259 .219 -0.040 .208 -0.011
xwOBA .261 .362 0.101 .322 -0.040
wOBA .316 .357 0.041 .300 -0.057
xSLG .343 .381 0.038 .422 0.041
SLG .426 .375 -0.051 .387 0.012
K% 18.6 14.0 -4.6 25.3 11.3
BB% 6.8 18.6 11.8 11.2 -7.4
Swing % 45.9 40.9 -5.0 46.5 5.6
Whiff% 17.6 23.0 5.4 28.1 5.1
In Zone % 53.6 42.5 -11.1 49.2 6.7
Out of Zone % 46.4 57.5 11.1 50.8 -6.7
Out of Zone Swing % 20.4 26.0 5.6 26.7 0.7
First Pitch Swing % 28.8 20.9 -7.9 34.3 13.4
First Pitch Strike % 64.4 46.5 -17.9 67.8 21.3
+ View Complete Year to Year Changes Leaderboard

Statcast Fielder Positioning

vs RHHvs LHH
YearAlignment TypePAwOBAPATotal%PATotal%
2022 Shifts 59 .316 32 4 12.5 27 22 81.5
2023 Shades 43 .357 19 0 0.0 24 7 29.2
2024 Shades 236 .294 132 13 9.8 104 51 49.0
! Note: Shifts are through the 2022 season, Shaded starting from the 2023 season, Shift: three or more infielders are on the same side of second base, Shade: positioned outside of their typical responsible slices of the field.
Learn more about how positioning is defined here

Pitch Tempo

Bases EmptyRunners On Base
SeasonTeamPitchesTempoFast %Slow %PitchesTempoFast %Slow %
2022 61 18.7 1.6% 1.6% 42 21.5 0.0% 0.0%
2023 38 16.5 10.5% 0.0% 44 20.8 0.0% 0.0%
2024 247 17.3 10.5% 0.4% 177 19.6 1.1% 2.3%

+ View Complete Pitch Tempo Leaderboard

Pitch Distribution