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MROS Three-Person Mechanics

Base Coverage Responsibilities for Watching Runners Leaving Too Soon on a Pitch

Runner on 1st only: U2 from the A position
   
Runner on 2nd only: U2 from the B position
   
Runner on 3rd only:  U3 from the E position
   
Runners on 1st and 2nd: 1st base - U2 from the B position
   
  2nd base - U3 from the E position
   
Runners on 1st and 3rd: 1st base - U2   from the B position
   
  3rd base - U3   from the E position
   
Runners on 2nd and 3rd: 2nd base - U2 from the B position
   
  3rd base - U3 from the E position
   
Base Loaded: 1st base - U3 from the E position
   
  2nd base - U2 from the B position
   
  3rd base - U3 from the E position

 

NOTE: The Plate Umpire is responsible for calling balls and strikes and never has base coverage for runners leaving too soon.