The Phillies and Giants play for 5 hours and 11 minutes, but the 15-inning contest ends in a 7 – 7 tie. Both teams score three in the 15th in the longest night game to date.

On June 28, 1961 The Phillies and Giants play for 5 hours and 11 minutes, but the 15-inning contest ends in a 7 – 7 tie. Both teams score three in the 15th in the longest night game to date.

Source
Baseball Reference June 28