Hank Aaron of the Milwaukee Braves hits in the second game of a doubleheader sweep of the Pittsburgh Pirates, the Braves winning, 3 – 2 and 4 – 1. This is the start of a 25-game hitting streak for Aaron, the longest of the season.

On July 15, 1956 Hank Aaron of the Milwaukee Braves hits in the second game of a doubleheader sweep of the Pittsburgh Pirates, the Braves winning, 3 – 2 and 4 – 1. This is the start of a 25-game hitting streak for Aaron, the longest of the season.

Source
Baseball Reference July 15