Mike Schmidt belts the 535th homerun of his career during 1st inning at San Diego, CA off San Diego Padres starting pitcher Andy Hawkins, moving Schmidt past Jimmie Foxxinto sole possession of 8th place on the all-time homerun list.

On May 20, 1988 — Mike Schmidt belts the 535th homerun of his career during 1st inning at San Diego, CA off San Diego Padres starting pitcher Andy Hawkins, moving Schmidt past Jimmie Foxxinto sole possession of 8th place on the all-time homerun list.

Source:
Baseball Reference May 20