Checking The Numbers: Perceived Velocity

Few pitchers utilize their fastballs more frequently than J.A. Happ of the Phillies does, as he throws his four-seamed heater 71 percent of the time. Unlike Max Scherzer, who throws his fastball at a similar rate but routinely registers 95+ miles per hour on the gun, Happ averages a relatively modest 89.7 mph with rather pedestrian movement.

Baseball Prospectus