Yankees vs. Red Sox (MLB)

Few rivalries in American sports capture tribalism like the Yankees-Red Sox feud, a century-old grudge born from the 1919 sale of Babe Ruth to New York. Over 2,300 games have been played, with the Yankees holding a 1,258-1,050 record (a 54.5% win rate) that outpaces #4 Old Firm's religious intensity in measurable head-to-head dominance. The 2004 ALCS, where Boston overcame a 3-0 deficit to win their first World Series in 86 years, remains a defining moment. With 27 Yankees championships to Boston's 9, concrete data proves this rivalry is data-led drama at its finest.