On June 9, 1939 against the pennant-winning Cincinnati Reds at the Polo Grounds, Danning was one of five Giants to hit a home run in the fourth inning, breaking the prior record of four home runs by a team in one inning. Remarkably, all five were hit by the Giants with two outs. Then, on June 15, 1940, he hit for the cycle in a game against Pittsburgh. His home run came on an inside-the-park home run that landed on the fly in front of the Giants' clubhouse, wedged behind the Eddie Grant memorial.