Loose arm action; long on back end, jabs straight down on first move after breaking hands; high 3/4 arm slot; above-average arm speed; repeats arm slot well; consistent arm action on all three pitches.
St. Lucie Mets (High A, Mets)
50, number four starter
Throws almost exclusively two-seam fastballs with good arm-side run; good downward plane; average present command with potential for above-average in-zone future command; generates velocity with minimal effort; potential to be a very strong pitch when down in the zone, will generate a lot of ground balls. Average velocity which won't miss bats but should generate weak contact.
Strong 12-6 movement, hard, sharp downward break; commands it well, throws it to both sides of the plate and to hitters from both sides; will throw it in any count, willing to pitch backwards; froze right-handed hitters repeatedly, but was also a swing-and-miss pitch versus left-handed hitters, who repeatedly swung over top of the pitch; already an above-average major league pitch, has the potential to be a legitimate plus offering.
Did not throw often, though used it more frequently the second and third time through the lineup; used primarily against left-handed hitters; throws it for strikes but didn't presently command it well in the strike zone; some arm side fade but little vertical movement; pitch has a chance to be average if it can become more consistent.
Gsellman's profile is limited because he features only average velocity and won't miss a ton of bats with his fastball, but his curveball will make up for the lack of velocity. It's a legitimate plus big league pitch that he is comfortable using against any hitter at any time.
His build is ideal for a starter, with a tall frame that generates a good downward plane with an easy delivery. He can stand to add a little weight in his lower half in order to handle the rigors of 200 innings a year, but is otherwise ideally built to be a starter.
Gsellman should fit nicely in the middle of a big league rotation, and even if the change-up never reaches its average potential, the curveball gives him a weapon to combat left-handed hitters. If the change-up gives him a legitimate third offering for hitters to consider, he could develop into a number three starter. As primarily a two-pitch pitcher, he can still remain a starter if he develops plus fastball command because of the swing-and-miss potential of the curveball.