Sean O'Sullivan
2009–2016 · P

Sean O'Sullivan

6' 1", 245 lbs·Lived to 39·Bats R / Throws R
Pitcher archetype· SP· CONTEXTUAL
Finesse / CommandBeats hitters with location and sequencing rather than velocity.2015–2016 · 1,538 pitches · 90.2 mph fastball
The Almanac's Take

AI-generated analysis coming soon.

Career Highs
5.49
Best ERA · 2010
4
Most W · 2010
43
Most K · 2010
1.446
Best WHIP · 2010
Career Arc · ERA
7 seasons
Statistical Comps

Career · Pitching

7 seasons
YearTeamGIPWLERAERA+SOWHIP
2009LAA1251.7425.9273291.471
2010KC1983.7465.4974431.446
2011KC1258.3267.2554191.783
2013SD725.0023.9697121.800
2014PHI312.7016.395971.342
2015PHI1371.0166.0865351.606
2016BOS521.3206.7562131.688
Career71323.71323158
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 · 1,525 pitches · 2015–2016
-24-12+12+24-24-12+12+24← GLOVE SIDEARM SIDE →HORIZONTAL BREAK (IN)INDUCED VERTICAL BREAK (IN)FFSLSICHCU
FF · 4-Seam Fastball36.1% · 90.4 mph
SL · Slider23.5% · 80.2 mph
SI · Sinker21.6% · 90.0 mph
CH · Changeup13.9% · 83.6 mph
CU · Curveball4.9% · 73.2 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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