Tall, sturdy frame; not much room in the frame for good weight; low 3/4 delivery; above-average arm speed; stab in the back; drop-and-drive delivery; clean foot strike; moderate effort in the delivery; 1.10-1.19 to home with a runner on first.
Mauricio Rubio Jr.
Kane County Cougars (Low A, D-backs)
40 - Swingman with middle relief fallback.
Command - 30/40
Movement - 50/60
88-90 out of the stretch; moderate run; mixes in fastballs with moderate sink and cut; poor command; relies almost exclusively on showing different looks with the fastball.
Drafted by the Arizona Diamondbacks in the 8th round of the 2013 MLB June Amateur Draft from Flowery Branch HS (Flowery Branch, GA).
Keller's fastball has three distinct looks as he can cut it, sink it and run it in on hitters. The different looks function as his secondaries as his pitch mix is fastball dominated. The secondaries are underdeveloped; he doesn't have much feel for his slider nor his change. Keller works too quickly out of the stretch and leaks energy and loses velocity on his fastball. Keller can learn a proper cutter and function as a 5th starter with middle relief as a fallback.