On July 2, 1993 At Philadelphia’s Veterans Stadium, the latest game in major league history ends at 4:40 am as relief pitcher Mitch Williams, in his first at-bat of the season, singles home the winning run in the 10th inning, giving the Philliesa 6 – 5 victory over the Padres. The game, which started at 1:26 am due to the three rain delays in Game 1 of the twin bill, eclipses the 3:35 mark established in Atlanta on July 4, 1985 in a game which ended with fireworks after the Mets beat the Braves in 19 innings, 16 – 13.

The second game ended with an estimated 6,000 fans at the ballpark.

 

Source:

Baseball Reference July 2