The Red Sox never turned back, winning 12 straight decisions from May 29 through June 11, including their second three-game sweep of the Tigers. On June 11, the Red Sox were 41–9, 10 games ahead of the Yankees. From June 5 through July 21, in 48 games, Ted Williams had a batting average of .399, with 18 home runs and 52 runs batted in. The Red Sox swept the Tigers for the third time that year on July 11–13. On July 14, Williams hit three home runs in a game. The Red Sox swept their rivals, the Yankees, in a double-header at Yankee Stadium on September 2, expanding their lead to 15.5 games ahead of the Yankees and 18 games ahead of the Tigers. The Red Sox clinched the American League Pennant on September 13. It was their first Pennant since 1918, when they won the World Series. The Red Sox ended the season 12 games ahead of the Tigers and 17 games ahead of the Yankees.