10/13/2013 - College PREP - Gambrills, MD David is a lean RHP that will graduate in 2015. Delivery is repeatable as he uses his lower half well and allows his arm action to work well to the plate through a high 3/4 arm slot. Arm strength is well above average as indicated by his top velocity of 82 mph. Fastball shows a range of 81-82 mph. Breaking ball displays 10/4 shape with downward / late break. He maintains arm speed on his changeup, showing a feel for with arm side run / sink. Off speed stuff are quality pitches that will get outs are the next level. Command / control are outstanding as he throws strikes with all his pitches and locates to both sides of the plate. Stock on the mound will continue to rise as more arm strength is gained through a long toss program. Mervis has an upside on the mound with an outstanding frame.