Pivotal World Series Moments
Giants Get to Mays - Or Did He Slack Off?
1921 World Series Game 4: New York Giants@New York Yankees
After Miller Huggins' Yankees won the first two games, the Giants romped in Game 3 13-5. So Huggins decided to go with his ace, Carl Mays, in Game 4. Mays had pitched a brilliant 3-0 five-hitter in Game 1. The Yankees got a break when Game 4 was rained out, giving Mays an extra day's rest. John McGraw came back with his Game 1 starter, spit­baller Phil Douglas.
Sunny and pleasant weather returned for Game 4, which drew a Sunday crowd of 36,372 to the Polo Grounds.

L-R: Carl Mays, Phil Douglas, Wally Schang
Mays picked up where he left off at the end of Game 1. The submariner didn't allow a hit until the 6th. Meanwhile, Douglas matched Mays zero for zero for four innings until C Wally Schang tripled to deep left field to drive home Mike McNally. Mays hurled ano­ther scoreless inning in the 7th when 1B George Kelly grounded into a 4-6-3 double play.
Douglas set down the Yanks 1-2-3 in the bottom of the 7th. That set the stage for the fateful top of the 8th.

L-R: Mike McNally, George Kelly, Ross Youngs, Johnny Rawlings
The leadoff batter in the Giants' 8th, RF Ross Youngs, smashed a long drive to left-center toward LF Babe Ruth, who was playing against doctors' orders with a bandage on his left elbow to cover an abscess. The ball sailed past him as Youngs reached third with a triple. Some reporters criticized Ruth's effort on the play, saying he "loafed" and played "slovenly" on what should have been just a double.
The next batter, 2B Johnny Rawlings, singled home Youngs with the tying run. That ended Mays' 16-inning scoreless string against the Giants.
The next batter, C Frank Snyder, bunted and reached first when Mays slipped on the grass going for the ball. Then Douglas sacrified the two runners over.
With CF George Burns at the plate, Mays shook off Schang's call for a curve ball and instead delivered a fastball that Burns hit past the drawn in infield, just out of the reach of SS Roger Peckinpaugh. Both runners scored to put the Giants in front 3-1. "The crowd was roaring wildly and the air was so filled with flying paper that it looked like a snow­storm."

L-R: George Burns, Roger Peckinpaugh, Irish Meusel, Kennesaw Mountain Landis
The Giants added a fourth run in the 9th on Kelly's double and LF Irish Meusel's sin­gle. Ruth slouted a homer to deep right field in the bottom of the inning to make the final score 4-2.
A possible explanation for Mays' sudden ineffectiveness–he allowed seven hits in the last two innings after limiting the Giants to just two in the first seven frames–came to light that night.
New York sportswriter Fred Lieb, who was in charge of the press arrangements for the World Series, was told by "an excited actor" that the afternoon's game had been thrown. He said that a great deal of money had been bet on the Giants, and Mays was given a sign between the 7th and 8th innings to stop bearing down. The actor claimed to have evi­dence to back up his story.
Lieb relayed the story to Colonel Tillie Huston, a half-owner of the Yankees, and the two made an early-morning visit to new baseball Commissioner K. M. Landis. Just two years removed from the 1919 World Series in which the Chicago "Black Sox" threw games, Landis did not dismiss the allegations. Despite the early hour, he contacted a de­tective agency and ordered them to tail Mays when he got up the next morning. A detec­tive remained with Carl for the rest of the Series but found nothing wrong with Mays' off-the-field conduct. When the actor could not produce any corroborating witnesses or evi­dence to substantiate his charges, Landis ended the investigation.
References:
Judge Landis and 25 Years of Baseball, J. G. Taylor Spink (1947)
1921: The Yankees, the Giants, and the Battle for Baseball Supremacy in New York, Lyle Spatz and Steve Steinberg (2010)