07/29/2012 - Under Armour Southwest Regional Tournament Callister continues to show improvements in his baseball abilities especially at the plate. Hitting / power grades are now outstanding through an athletic setup. Hands are quick, generating outstanding bat speed to and through the ball at contact. He has strength in his swing with the baseball exploding off his bat when centered. At the event, he was 6 for 11 with 2 2B. At 3B, feet are active as he works to square balls up and makes the routine plays. On the mound, arm strength has improved slightly as he threw his best velocity to date, topping out at 82 mph. Fastball shows a range of 79-82 mph with slight arm side run. Breaking ball displays early break as he needs to work to stay on top of pitch more to improve.