- as Adrian Monk
- as Sharona Fleming
- as Scott Gregorio
- as Walker Browning
- as Lyle Turrow
- as Robin Jenkins
- as Lawrence Hammond
- as Sgt. Chitwood
- as Frank Henley
- as Erin Hammond
- as Other Coach
- as Umpire
- as Captain Leland Stottlemeyer
- as Truck Driver
- as Lt. Randall Disher
- as Darryl Grant
- as Dr. Charles Kroger
- as Sports Reporter
- as Commentator #1
- as Commentator #2
- as First Reporter
- as Second Repoter
- as Third Reporter
- as Assistant
- as Ballplayer / Flasher
- as Jared Stottlemeyer
- as Benjy Fleming
Watch "Monk > Mr. Monk Goes to the Ballgame":