The right-hander from T.C. Williams High School (Va.) had a big performance in Virginia's Commonwealth Games last year, showing off a fastball that touches 94 mph. It was there that he caught the eye of Braves area scout Gene Kerns, who also discovered Brandon Beachy at a Virginia Valley Summer League game. Grosser has a whippy arm action that produces good sink on his fastball, while his offspeed pitches need a little work.
That's to be expected of the 6-foot-2, 186-pounder, who also quarterbacked his high school football team and is far from a finished product.
The George Mason signee led his high school to the regional playoffs for the first time since 2009 with a six-inning, one-hit performance in mid-May in which he struck out 10 batters.
Eric Single is an associate reporter for MLB.com. Braves beat writer Mark Bowman reported on Jason and Jacob Heyward from Los Angeles. This story was not subject to the approval of Major League Baseball or its clubs.