Marvin Hagler

Marvin Hagler's 62-3-2 record with 52 knockouts included an undisputed middleweight championship reign of seven years (1980-1987), 40% longer than the average titleholder in that era. His 1985 war with Tommy Hearns—often called the greatest first round in boxing history—featured 112 punches thrown, 15% more than any other famous opening round on record. Hagler's technically brilliant defeat of Roberto Duran in 1983, where he landed 58% of his power shots, outperforms Sugar Ray Leonard's split-decision win over Duran in terms of defensive efficiency.