Mastrobuoni will start at third base and bat seventh in Sunday's game against the Nationals.
Since being reinstated from the 60-day injured list Wednesday, Mastrobuoni has gotten five straight starts (four at third base, one at second) while going 3-for-13 with a walk, a stolen base, two runs and an RBI. His run of regular playing time will likely come to an end Tuesday, however, with J.P. Crawford (hand) set to return from the 10-day IL and bump Mastrobuoni into a utility role.