Coverage Responsibilities from Starting Position A
• If the base umpire does not cover, the plate umpire is responsible for all fly balls and all fair or foul decisions.
• The base umpire should cover only on fly balls hit from the center fielder to the right-field dead-ball line.
• Plate umpire has from the center fielder to the left-field dead-ball line.
Coverage Responsibilities from Starting Positions B and C
• If the base umpire does not cover, the plate umpire is responsible for all fly balls and all fair or foul decisions
• Base umpire should cover only on fly balls hit from the right fielder to the left fielder (the “V”).
• Plate umpire has from the right fielder to the right-field dead-ball line, from the left fielder to the left-field dead-ball line, and all fair or foul calls.
Tips for Covering fly balls in a two-umpire system
It is sometimes helpful to base umpires when working the two-umpire system to pretend that they are working the three-umpire system and their partner has always covered. With no runners on (position A) or with a runner on first base only (position B), pretend that the third-base umpire has covered. From position C, pretend that the first-base umpire has covered. When chasing with runners on base, you should return to the infield as outlined below.
• Never return for the initial play (for example, you cover with a runner on first and the right fielder tries to throw out the batter-runner at first)
• Most usually return for a play at second base when the plate umpire has a play at the plate.
• Let the plate umpire know where you are.
• Do not return to home plate.
• You do not have to return to the infield, nor should you always, but you must always be prepared to do so.