New York Mets closer John Franco becomes the first left-hander in major league history to record 300 saves, exactly 12 years after he gained his first save with the Cincinnati Reds.

This Day In Baseball

On April 29, 1996 — New York Mets closer John Franco becomes the first left-hander in major league history to record 300 saves, exactly 12 years after he gained his first save with the Cincinnati Reds.

Source
Baseball Reference April 29