ANSWER: Golf

Jack Nicklaus

Only five golfers have won all four of golf's modern Majors at any time during their career, an achievement which is often referred to as a Career Grand Slam: Gene Sarazen, Ben Hogan, Gary Player, Jack Nicklaus, and Tiger Woods. Both Woods and Nicklaus have three Career Grand Slams, having won each major at least three times.

Matt: WRONG
Record: 275-229