According to the most popular version of the story, Pipp showed up at Yankee Stadium that day with a severe headache, and asked the team's trainer for two aspirin. Miller Huggins, the Yankees' manager, noticed this, and said "Wally, take the day off. We'll try that kid Gehrig at first today and get you back in there tomorrow." Gehrig played well and became the Yankees' new starting first baseman. This story first appeared in a 1939 New York World-Telegram on Gehrig's career, in which Pipp was interviewed. Pipp was later quoted to have said, "I took the two most expensive aspirin in history."[2][3][13]
According to The Pride of the Yankees, the 1942 film about Gehrig's life, Pipp asked out of the game because he was experiencing double vision from being hit in the head two days prior.[2] By 1953, Pipp reported to The New York Times that he was taken out of the lineup due to being hit in the head by a pitch thrown by Charlie Caldwell during batting practice. However, while Pipp was hit in the head by a pitch from Caldwell and was hospitalized, this event occurred on July 2, a month after Pipp's benching.[2]
The New York Sun reported that the benching was due to Pipp's struggles against left-handed pitchers, as southpaw George Mogridge was the scheduled starting pitcher for the Senators on June 2. Other sources suggest Yankee manager Miller Huggins may have actually benched Pipp and other veterans in order to "shake up" the slumping lineup.[2] According to another story, supported by Gehrig's wife, Pipp was not at the game on June 2 because he was gambling on horse racing at a race track.[14] His son Tom denied this rumor, stating that his father never bet on horses.[15] When interviewed by Sports Illustrated, Pipp's own children disagreed on the reason for their father's benching, believing it was either due to Pipp being beaned, or struggling.[2] One of his sons believes that Pipp told Huggins to play Gehrig in his place, as he knew that Gehrig had a future with the Yankees, while he likely did not.
Wally Pipp - Wikipedia