Jack Nicklaus
The record is the argument: 18 professional majors, and — the stat that may be more astonishing — 19 second-place finishes in majors. Nicklaus was the best player in the world, or within a shot of it, for 25 years. He won his first major beating Arnold Palmer in a US Open playoff at Oakmont in 1962 as a 22-year-old rookie and his last with a back-nine 30 at the 1986 Masters at 46, the oldest Masters champion ever. Between those bookends: six green jackets, five PGA Championships, four US Opens, three Opens, three career Grand Slams completed, 73 PGA Tour wins and 73 top-10 finishes in majors. He did it against Palmer, Player, Trevino and Watson — Hall of Famers in their primes who took majors off him repeatedly and never diminished him. Add the conservative-aggressive strategic framework that anticipated modern analytics by 50 years, and Nicklaus is the most complete competitive record golf has produced.