Ronald Bolaños
P | Bats/Throws: R/R | 6' 2" 230LBS | Age: 28
W L ERA G GS SV IP SO WHIP
2020 0 2 12.27 2 2 0 3.2 2 3.00
2021 0 0 1.42 3 0 0 6.1 10 0.95
2022 0 0 4.42 8 0 0 18.1 12 1.75
4 Seasons 0 4 5.25 18 5 0 48 43 1.63
G W-L ERA IP SO WHIP
2020 2 0-2 12.27 3.2 2 3.00
2021 3 0-0 1.42 6.1 10 0.95
2022 8 0-0 4.42 18.1 12 1.75
4 Seasons 18 0-4 5.25 48 43 1.63
MLB Percentile Rankings
Movement Profile (Induced Break)
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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
2019 22 346 56 3 5.4 3.4 90.0 112.5 10.9 37.5 .289 .444 .338 .365 .414 48.2 21.6 13.6 5.95 6.12
2020 23 73 15 2 13.3 9.5 92.4 106.6 5.0 33.3 .390 .747 .575 .525 .548 40.0 9.5 14.3 12.27 15.70
2021 24 106 13 0 0.0 0.0 81.6 111.1 18.1 15.4 .141 .163 .196 .180 .239 15.4 40.0 8.0 1.42 1.39
2022 25 332 60 4 6.7 4.6 91.0 110.6 8.8 28.3 .286 .437 .368 .373 .373 43.3 13.8 13.8 4.42 6.09
Player 857 144 9 6.3 4.1 89.9 112.5 10.1 31.3 .278 .432 .356 .362 .394 42.4 19.5 13.1
MLB 7.0 4.8 88.5 122.4 12.3 33.2 .245 .405 .316 .315 .368 36.5 22.2 8.4
! Note: All figures in this table cover the period 2015-present.

Statcast Pitch Arsenal

Bolaños relies on 5 pitches.
Sinker
(33.4%) ,
Slider
(30.1%) ,
Four Seamer
(21.1%) ,
Curveball
(10.5%) ,
Changeup
(4.8%) ,


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Pitch Tracking



Batted Ball Profile

Season GB % FB % LD % PU % Pull % Straight % Oppo % Weak % Topped % Under % Flare/Burner % Solid % Barrel % Barrel/PA
2019 41.1 25.0 30.4 3.6 50.0 26.8 23.2 1.8 32.1 23.2 28.6 7.1 5.4 3.4
2020 53.3 26.7 20.0 0.0 20.0 66.7 13.3 0.0 33.3 6.7 40.0 0.0 13.3 9.5
2021 38.5 30.8 15.4 15.4 30.8 38.5 30.8 0.0 30.8 46.2 23.1 0.0 0.0 0.0
2022 50.0 25.0 23.3 1.7 38.3 38.3 23.3 1.7 36.7 21.7 28.3 5.0 6.7 4.6
Player 45.8 25.7 25.0 3.5 40.3 36.8 22.9 1.4 34.0 22.9 29.2 4.9 6.3 4.1
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
2022 4-Seam Fastball KC R 70 93.0 18.3 -3.4 6.2ARM -0.3 13.2 -3.0 6.2ARM -1.1
2022 Slider KC R 100 84.1 37.9 0.6 7.8GLV 2.3 0.5 1.3 7.8GLV 2.1
2022 Sinker KC R 111 93.1 21.3 0.3 10.8ARM -3.4 10.1 -1.8 10.8ARM -4.0
2022 Curveball KC R 35 77.0 52.4 -5.2 13.8GLV 4.4 -6.0 -3.9 13.8GLV 4.7
2022 Changeup KC R 16 87.1 27.4 -1.8 10.7ARM -3.3 8.5 -2.6 10.7ARM -3.5
2021 Sinker KC R 36 95.0 19.6 -0.1 13.3ARM -1.4 10.6 -1.8 13.3ARM -1.5
2021 Changeup KC R 4 90.2 21.4 -5.0 11.2ARM -2.5 12.0 -5.7 11.2ARM -2.7
2021 Curveball KC R 17 79.8 43.6 -9.9 11.9GLV 3.5 -0.8 -9.3 11.9GLV 2.7
2021 4-Seam Fastball KC R 19 95.2 15.5 -1.9 8.9ARM 1.9 14.5 -1.7 8.9ARM 1.7
2021 Slider KC R 30 86.3 33.2 -1.2 5.0GLV 0.6 3.3 -1.5 5.0GLV -0.7
! Note: Years are in reverse order.

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 %
2022 Sinker -2.0 -2 111 33.4 37 .321 .357 .399 13.0 2.7 7.1 .334 .405 .417 44.4
2022 Slider -0.2 0 100 30.1 22 .211 .526 .295 44.2 36.4 38.1 .178 .409 .265 30.8
2022 4-Seam Fastball 0.7 1 70 21.1 18 .267 .333 .336 17.2 5.6 5.9 .317 .480 .404 57.1
2022 Curveball 0.1 0 35 10.5 7 .333 .667 .457 15.4 28.6 22.2 .240 .492 .366 50.0
2022 Changeup -4.6 -1 16 4.8 2 .500 1.000 .625 0.0 0.0 -- .563 .653 .544 0.0
2021 Sinker 4.9 2 36 34.0 12 .182 .182 .208 35.0 41.7 45.5 .110 .130 .157 0.0
2021 Slider 3.2 1 30 28.3 6 .167 .167 .150 60.0 50.0 37.5 .257 .297 .246 33.3
2021 4-Seam Fastball -1.4 0 19 17.9 4 .333 .333 .400 20.0 25.0 16.7 .158 .164 .282 50.0
2021 Curveball 2.6 0 17 16.0 2 .000 .000 .000 20.0 50.0 33.3 .013 .015 .012 0.0
2021 Changeup 1.2 0 4 3.8 1 .000 .000 .000 0.0 0.0 -- .003 .005 .003 0.0
! Note: Years are in reverse order.
! Note: To better align with other values, positive numbers (red) are good, and negative numbers (blue) are poor.

Spin Direction

Year Pitch Type Pitches MPH Active Spin % Total Movement (In.) Spin-Based Observed Deviation
2022 Changeup 16 87.1 91 13.6 1:00 2:00 -60
2022 Curveball 35 77.0 69 17.2 7:30 8:00 -30
2022 4-Seam Fastball 70 93.0 74 14.2 12:30 1:00 -30
2022 Sinker 110 93.1 78 14.6 12:30 1:45 -75
2022 Slider 100 84.1 41 8.8 9:00 8:45 15
2021 Curveball 17 79.8 63 13.1 8:00 8:45 -45
2021 4-Seam Fastball 19 95.2 82 16.7 12:45 1:15 -30
2021 Sinker 34 95.0 84 16.8 12:45 1:45 -60
2021 Slider 30 86.3 42 6.7 9:30 10:00 -30
! Note: Years are in reverse order.
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! Note: This table is showing data from the PITCHER perspective.
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Pitcher Arm Angle

! Note: Data is available from 2020 through the present.
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Swing/Take

Runs
Year Team PA Pitches Heart Shadow Chase Waste All
2019 88 346 6 0 -3 -3 0
2021 25 106 1 3 -1 0 3
2022 86 332 0 2 -2 -2 -3
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Plate Discipline

Season Pitches Zone % Zone Swing % Zone Contact % Chase % Chase Contact % Edge % 1st Pitch Strike % Swing % Whiff % Meatball % Meatball Swing %
2019 346 46.5 65.2 82.9 20.0 54.1 43.4 48.9 41.0 23.9 7.5 76.9
2020 73 53.4 71.8 82.1 11.8 100.0 41.1 42.9 43.8 15.6 5.5 100.0
2021 106 43.4 65.2 76.7 35.0 42.9 44.3 44.0 48.1 37.3 7.5 87.5
2022 332 43.7 63.4 87.0 23.0 53.5 45.8 50.6 40.7 23.7 6.0 90.0
Player 857 45.6 65.2 83.5 22.5 53.3 44.2 48.4 42.0 25.0 6.8 84.5
MLB 48.7 67.0 82.0 28.5 57.8 42.6 61.0 47.2 25.0 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
2019 66 47 69 78
2021 75 48 72
2022 36 42 69
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Expected Home Runs

Adjusted

Year Team Avg HR Trot Actual HR xHR HR-xHR Doubters Mostly Gone No Doubters No Doubter %
2019 22.8 3 2.1 1 1 1 1 33.3
2020 23.6 2 1.6 0 0 2 0 0.0
2022 21.3 2 2.1 0 1 2 0 0.0
Player 22.6 7 5.9 1 2 5 1 14.3
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.
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Expected Home Runs by Park

Adjusted

Year HR
2019 3 2 2 2 2 3 2 2 2 1 2 3 2 2 2 2 1 2 2 3 2 2 3 2 2 2 2 3 2 3 2
2020 2 2 1 2 1 2 2 2 0 2 1 1 2 2 2 1 2 2 2 2 2 1 2 2 2 2 1 1 2 2 0
2022 2 1 2 2 2 2 2 2 2 2 2 2 3 2 2 3 2 2 2 2 3 2 3 3 2 2 2 2 3 2 1
Player 7 5 5 6 5 7 6 6 4 5 5 6 7 6 6 6 5 6 6 7 7 5 8 7 6 6 5 6 7 7 3
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.
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Year to Year Changes

Metric 2019 2020 +/-   2021 +/-   2022 +/-  
Fastball Velocity 94.2 95.2 1.0 95.1 -0.1 93.1 -2.0
Offspeed Velocity 86.2 87.8 1.6 90.2 2.4 87.1 -3.1
Breaking Velocity 78.5 82.1 3.6 83.9 1.8 82.3 -1.6
Exit Velocity 90.0 92.4 2.4 81.6 -10.8 91.0 9.4
Launch Angle 10.9 5.0 -5.9 18.1 13.1 8.8 -9.3
Barrel % 5.4 13.3 7.9 0.0 -13.3 6.7 6.7
Hard Hit % 48.2 40.0 -8.2 15.4 -24.6 43.3 27.9
LA Sweet-Spot % 37.5 33.3 -4.2 15.4 -17.9 28.3 12.9
xBA .289 .390 0.101 .141 -0.249 .286 0.145
BA .230 .471 0.241 .174 -0.297 .286 0.112
xwOBA .365 .525 0.160 .180 -0.345 .373 0.193
wOBA .338 .575 0.237 .196 -0.379 .368 0.172
xSLG .444 .747 0.303 .163 -0.584 .437 0.274
SLG .459 .824 0.365 .174 -0.650 .443 0.269
K% 21.6 9.5 -12.1 40.0 30.5 13.8 -26.2
BB% 13.6 14.3 0.7 8.0 -6.3 13.8 5.8
Swing % 41.0 43.8 2.8 48.1 4.3 40.7 -7.4
Whiff% 23.9 15.6 -8.3 37.3 21.7 23.7 -13.6
In Zone % 46.5 53.4 6.9 43.4 -10.0 43.7 0.3
Out of Zone % 53.5 46.6 -6.9 56.6 10.0 56.3 -0.3
Out of Zone Swing % 20.0 11.8 -8.2 35.0 23.2 23.0 -12.0
First Pitch Swing % 18.2 33.3 15.1 20.0 -13.3 23.0 3.0
First Pitch Strike % 48.9 42.9 -6.0 44.0 1.1 50.6 6.6
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Statcast Fielder Positioning

vs RHHvs LHH
YearAlignment TypePAwOBAPATotal%PATotal%
2019 Shifts 88 .338 40 5 12.5 48 23 47.9
2020 Shifts 21 .575 11 4 36.4 10 4 40.0
2021 Shifts 25 .196 15 2 13.3 10 7 70.0
2022 Shifts 86 .368 55 3 5.5 31 20 64.5
! 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 %
2019 99 15.2 45.5% 0.0% 74 20.3 5.4% 5.4%
2020 14 19.4 7.1% 0.0% 16 22.5 0.0% 6.3%
2021 26 20.2 3.8% 0.0% 23 26.7 0.0% 13.0%
2022 96 18.8 13.5% 2.1% 70 23.7 1.4% 17.1%

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Pitch Distribution