Muller has teamed up with Southern League all-stars Ian Anderson and Tucker Davidson–as well as prospect Joey Wentz–to form one of the best rotations in the minors this season for Mississippi. The M-Braves roll out a potential big league arm almost every game, and Muller’s strongest supporters think he might be the best of the bunch. The big lefty has held opponents to a sub-.200 average in 2019 and struck out nearly 30-percent of batters faced.
There’s some effort through a semi-windup delivery, though Muller is strong enough to pitch through it and overpowers hitters with a fastball that touches 95-96 mph. His best off-speed is an upper-70s curve, with a slider and changeup that make up a deep mix of usable pitches. Muller’s size, velocity, and ability to miss bats could make him a mid-rotation starter if he can improve his control. The degree he’s able to cut down his below-average walk rate will dictate whether Muller reaches that ceiling.