Ball sensing

A pitch monitoring system for use with a portable electronic device. The system includes a processor, a ball having a core and a cover assembly, at least one sensor for sensing movement of the ball, a data output device in communication with the sensor, and a non-transient computer-readable medium containing code. The cover assembly includes comprising panels joined by stitching and surrounding the core. The output device transmits the signals to the portable electronic device. The code directs the processor to receive signals indicating movement of the ball relative to a strike zone during a pitch of the ball by a first user, retrieve a batting characteristic of a simulated batter corresponding to the indicated movement of the ball relative to the strike zone during the pitch, and output a simulated pitch result for the pitch based on the retrieved batting characteristic of the simulated batter for the indicated movement.