Aaron Bates of the Lancaster JetHawks becomes the first player in the 61-year history of the California League to hit four home runs in one game. Amazingly, his teammate Brad Correll will match the feat just 35 days later.

This Day In Baseball

On May 19, 2007 — Aaron Bates of the Lancaster JetHawks becomes the first player in the 61-year history of the California League to hit four home runs in one game. Amazingly, his teammate Brad Correll will match the feat just 35 days later.

Source:
Baseball Reference May 19