The 1921 World Series was the championship series in Major League Baseball for the 1921 season. The 18th edition of the World Series, it matched the National League champion New York Giants and the American League champion New York Yankees. The Series matched two distinct teams in strategy with the Giants, dedicated practitioners of the dead-ball era's "inside game" and the Yankees, who relied on the "power game" exemplified by Babe Ruth, who was coming off of what was arguably his best year ever statistically. This was the first World Series appearance by the Yankees, who have gone on to play in the Series a record 40 times. The 1921 Series was a closely contested matchup that ended on a double play featuring a baserunning miscue. It was also the last of four World Series to use the best-of-nine format, which had been used in the 1903, 1919, and the 1920 editions. The following year, the World Series permanently switched to a best-of-seven game format where it has remained ever since. It was also the first World Series to be broadcast over radio. Background The Series was the last of the experimental best-five-of-nine series, which the Giants won five games to three. All eight games were played at the Polo Grounds in upper Manhattan, New York, each team alternating as the nominal "home team" since the Yankees had subleased the stadium from the Giants for the 1913 through 1922 seasons, so that it was the home park for both teams during the regular season in those ten years. This marked the first time in World Series history that the series occurred at a single site. It happened again the following year in the same place with the same two teams, in 1944 at St. Louis' Sportsman's Park between the Cardinals and the Browns, and then again in 2020 when the COVID-19 pandemic necessitated the first-ever neutral-site Series played at Globe Life Field in Arlington, Texas between the Los Angeles Dodgers and Tampa Bay Rays. For New Yorkers, this was the first subway Series in World Series history. It was also the first World Series to be broadcast on radio, with Grantland Rice covering the games live through Pittsburgh's KDKA. It was rebroadcast on WBZ in Massachusetts. Announcer Tommy Cowan also recreated the games over Westinghouse-owned WJZ in Newark as he listened to phoned-in reports from the stadium. Because of an