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Murderers' Row (1926–1928)

Ruth spent part of the offseason of 1925–26 working out at Artie McGovern 's gym, where he got back into shape. Barrow and Huggins had rebuilt the team and surrounded the veteran core with good young players like Tony Lazzeri and Lou Gehrig, but the Yankees were not expected to win the pennant.

Ruth returned to his normal production during 1926, when he batted.372 with 47 home runs and 146 RBIs. The Yankees built a 10-game lead by mid-June and coasted to win the pennant by three games. The St. Louis Cardinals had won the National League with the lowest winning percentage for a pennant winner to that point (.578) and the Yankees were expected to win the World Series easily. Although the Yankees won the opener in New York, St. Louis took Games Two and Three. In Game Four, Ruth hit three home runs—the first time this had been done in a World Series game—to lead the Yankees to victory. In the fifth game, Ruth caught a ball as he crashed into the fence. The play was described by baseball writers as a defensive gem. New York took that game, but Grover Cleveland Alexander won Game Six for St. Louis to tie the Series at three games each, then got very drunk. He was nevertheless inserted into Game Seven in the seventh inning and shut down the Yankees to win the game, 3–2, and win the Series. Ruth had hit his fourth home run of the Series earlier in the game and was the only Yankee to reach base off Alexander; he walked in the ninth inning before being thrown out to end the game when he attempted to steal second base. Although Ruth's attempt to steal second is often deemed a baserunning blunder, Creamer pointed out that the Yankees' chances of tying the game would have been greatly improved with a runner in scoring position.

The 1926 World Series was also known for Ruth's promise to Johnny Sylvester, a hospitalized 11-year-old boy. Ruth promised the child that he would hit a home run on his behalf. Sylvester had been injured in a fall from a horse, and a friend of Sylvester's father gave the boy two autographed baseballs signed by Yankees and Cardinals. The friend relayed a promise from Ruth (who did not know the boy) that he would hit a home run for him. After the Series, Ruth visited the boy in the hospital. When the matter became public, the press greatly inflated it, and by some accounts, Ruth allegedly saved the boy's life by visiting him, emotionally promising to hit a home run, and doing so. Ruth's 1926 salary of $52,000 was far more than any other baseball player, but he made at least twice as much in other income, including $100,000 from 12 weeks of vaudeville.

The 1927 New York Yankees team is considered one of the greatest squads to ever take the field. Known as Murderers' Row because of the power of its lineup, the team clinched first place on Labor Day, won a then-AL-record 110 games and took the AL pennant by 19 games. There was no suspense in the pennant race, and the nation turned its attention to Ruth's pursuit of his own single-season home run record of 59 round trippers. Ruth was not alone in this chase. Teammate Lou Gehrig proved to be a slugger who was capable of challenging Ruth for his home run crown; he tied Ruth with 24 home runs late in June. Through July and August, the dynamic duo was never separated by more than two home runs. Gehrig took the lead, 45–44, in the first game of a doubleheader at Fenway Park early in September; Ruth responded with two blasts of his own to take the lead, as it proved permanently—Gehrig finished with 47. Even so, as of September 6, Ruth was still several games off his 1921 pace, and going into the final series against the Senators, had only 57. He hit two in the first game of the series, including one off of Paul Hopkins, facing his first major league batter, to tie the record. The following day, September 30, he broke it with his 60th homer, in the eighth inning off Tom Zachary to break a 2–2 tie. "Sixty! Let's see some son of a bitch try to top that one", Ruth exulted after the game. In addition to his career-high 60 home runs, Ruth batted.356, drove in 164 runs and slugged.772. In the 1927 World Series, the Yankees swept the Pittsburgh Pirates in four games; the National Leaguers were disheartened after watching the Yankees take batting practice before Game One, with ball after ball leaving Forbes Field. According to Appel, "The 1927 New York Yankees. Even today, the words inspire awe... all baseball success is measured against the '27 team."

The following season started off well for the Yankees, who led the league in the early going. But the Yankees were plagued by injuries, erratic pitching and inconsistent play. The Philadelphia Athletics, rebuilding after some lean years, erased the Yankees' big lead and even took over first place briefly in early September. The Yankees, however, regained first place when they beat the Athletics three out of four games in a pivotal series at Yankee Stadium later that month, and clinched the pennant in the final weekend of the season. Ruth's play in 1928 mirrored his team's performance. He got off to a hot start and on August 1, he had 42 home runs. This put him ahead of his 60 home run pace from the previous season. He then slumped for the latter part of the season, and he hit just twelve home runs in the last two months. Ruth's batting average also fell to.323, well below his career average. Nevertheless, he ended the season with 54 home runs. The Yankees swept the favored Cardinals in four games in the World Series, with Ruth batting.625 and hitting three home runs in Game Four, including one off Alexander.