Sean O'Brien
Sean O'Brien
Sean O'Brien
Sean O'Brien
Sean O'Brien
Sean O'Brien




St. Louis
Marquette University (HS) • WI
6-0 • 180LBS • R/R


2018 National

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2018 State

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3/25/18 - St. Louis signee. Ranked No. 36 in Wisconsin’s Class of 2018. 6-foot, 180-pound right-handed pitcher, athletic, muscular build. Drop and drive delivery, long draw,  quick arm action, high ¾ arm slot, repeats. Fastball, sat 84-86, up to 87.1, commanded. Curveball, 11/5 shape, 70-73.5, 2000-2180 rpm. Threw a high volume of strikes, pitched to contact.
3/13/16 - Saint Louis commit. 6-foot, 180-pound right-handed hitting RHP/3B with a strong frame. On the mound works from a high ¾ arm angle with a long, quick arm action. Long, high draw out of the glove. Drop and drive, online delivery with some effort. Fastball sat 81-82 topping out at 83 mph. Curveball showed 11-5 shape at 66-68 mph. Maintained fastball arm speed on changeup at 74-77 mph. Defensively has a long arm action from a high ¾ arm slot. Accurate throws with carry, throwing 82 mph across the infield. Offensively hits from a tall stance with a low hand set. Leg kick stride with average balance. Uphill swing path, flashed a fast bat. Showed strength thru contact with 88 mph exit velocity from a tee. Ran the 60 at 7.10.
11.11.15 - Verbally committed to Saint Louis University.

7.20.15 - 6-foot, 175-pound two-way player, carries strength, athletic build. On the mound uses a slight drop and drive style delivery. Arm action has a long draw, release from the ear, over the top slot. Fastball is mostly straight four seam, showed control of the zone, flashed arm strength touching 82 mph, sat 78-80 mph for most of his outing. Curveball has 12/6 action, feel for the zone, showed depth with proper spin, 65-67 mph. Right-handed hitter, balanced stance, short stride, smooth loading action, maintained strong balance. Bat strength hitter, path works slightly uphill, producing gap power. 91 mph exit velocity from the tee. Defensively fields the baseball out in front, third base type defender. Arm action is short, over the top slot, arm has carry and accuracy to stick on the left side (80 mph). Ran a 4.62 down the line.
6.24.15 - 6-foot-0, 175-pound, athletic build, good projectability, right-handed hitter. On the mound displayed a tall-and-fall delivery, short arm action, high ¾ arm slot, landing square on line, athletic finish. Straight fastball sat 80-81 mph. Curveball showed 11/5 shape, thrown for strikes, 63-65 mph. Changeup sat 72-74 mph. Hit from a tall, balanced set up, loads back, short stride, good balance. Fast bat speed, uphill bat path, pull-side approach, 87 mph exit velocity. Defensively showed soft hands, fluid footwork, over-the-top arm slot, with accuracy, 78 mph across the infield. Ran a 7.57 60-time.
3/15/15- 6-foot, 175-pound two-way player, average frame, slender build. Defensively fields out in front, works through the baseball, mechanical actions. Arm plays short and over the top, 76 mph across the diamond. Hits from the right side, balanced stance, loads hands, short stride. Slight uppercut path, bat speed present, 85 mph exit velocity from the tee. On the mound delivery works with ease, short high ¾ arm action. Projects better on the mound. Fastball was mostly down, 76-78 mph. Curveball has 11/5 shape, gradual action, 61-64 mph. Straight change showed feel at the bottom of the zone, 72-74 mph. 4/5/14 - 5-foot-10, 145-pound two-way player, long lanky frame. Offensively hits from an opened and tall setup, regular stride back to even. Line drive, gap to gap hitter, showed bat speed, loose hands with whip, 85 mph exit velocity from the tee. Defensively arm played at 70 mph across the diamond, short arm action. Long gangly actions, corner infield type, clean exchange showed body control. 4.58 runner home to first. On the mound arm action is loose and quick, short arm action from high ¾ slot. Fastball has slight sink, 71-73 mph, showed feel for the zone. Advanced curveball for age, 12/6 action, sharp bite for age, near fastball arm speed with feel, 60-61 mph. Straight changeup with feel, 67-69 mph, showed control of the zone.

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