In one of the few games in which both pitch, Christy Mathewson and Grover Cleveland Alexander appear as relievers in a 5 – 3 victory for the New York Giants over the Philadelphia Phillies.

On May 26, 1911 — In one of the few games in which both pitch, Christy Mathewson and Grover Cleveland Alexander appear as relievers in a 5 – 3 victory for the New York Giants over the Philadelphia Phillies.

Source:
Baseball Reference May 26