A record 31,500 at the Polo Grounds see the Giants beat Pittsburgh, 7 – 3, behind Christy Mathewson. Matty allows eight hits in beating Brickyard Kennedy, who is bricked for 13 safeties. The first-place New Yorkers will soon fade, and the Pirates, now in third place, will win their third straight pennant.

On May 16, 1903 — A record 31,500 at the Polo Grounds see the Giants beat Pittsburgh, 7 – 3, behind Christy Mathewson. Matty allows eight hits in beating Brickyard Kennedy, who is bricked for 13 safeties. The first-place New Yorkers will soon fade, and the Pirates, now in third place, will win their third straight pennant.

Source:
Baseball Reference May 16