Justin Masterson
2008–2015 · P

Justin Masterson

6' 6", 260 lbs·Lived to 41·Bats R / Throws R
All-Star
Pitcher archetype· SP· CONTEXTUAL
Sinker / Ground BallPounds the bottom of the zone with sinkers and lives on ground balls.2015–2015 · 1,010 pitches · 87.7 mph fastball
The Almanac's Take

AI-generated analysis coming soon.

Career Highs
3.16
Best ERA · 2008
14
Most W · 2013
195
Most K · 2013
1.202
Best WHIP · 2013
Career Arc · ERA
8 seasons
Statistical Comps

Career · Pitching

8 seasons
YearTeamGIPWLERAERA+SOWHIP
2008BOS3688.3653.16137681.223
2009BOS42129.34104.52951191.454
2010CLE34180.06134.70871401.500
2011CLE34216.012103.211231581.278
2012CLE34206.311154.93811591.454
2013CLE32193.014103.451121951.202
2014CLE28128.7795.88641161.632
2015BOS1859.3425.6170491.601
Career2581200.964741004
Pitch Movement Map

Each pitch type this pitcher throws regularly, placed by how the ball moves — sideways break across, rise or drop down the side. Each dotted ring holds about the middle 85% of the league’s pitches of that type, so a cluster sitting outside its ring is movement most pitchers don’t have.

RHP · 1,010 pitches · 2015–2015
-24-12+12+24-24-12+12+24← GLOVE SIDEARM SIDE →HORIZONTAL BREAK (IN)INDUCED VERTICAL BREAK (IN)SISLFFCH
SI · Sinker37.7% · 87.4 mph
SL · Slider29.4% · 79.2 mph
FF · 4-Seam Fastball28.5% · 88.1 mph
CH · Changeup4.4% · 85.5 mph

The dots — a sample of this pitcher’s regular-season pitches, placed by movement: left–right is horizontal break, up–down is induced vertical break (what the pitch does beyond gravity). The view is handedness-neutral — positive break is toward the pitcher’s arm side for lefties and righties alike, so every sinker runs right and every sweeper breaks left, whoever throws it.

The dotted rings — about the middle 85% of where each pitch type lands league-wide (a 2-standard-deviation spread), measured from 7.5 million regular-season pitches since 2015. A cluster sitting well outside its ring is movement most of the league doesn’t get. Spring training and the postseason are excluded.

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