Um, wrestling is not a sport guys. But if it was, I'd pick Bruno Sammartino and the Hulkster.

I believe the qualifier in the original question was "who dominated thier sport the most?"

Baseball--Babe Ruth, easy
Basketball--Michael Jordan, easy
Hockey--Wayne Gretzky, easiest
Football--The toughest of the majors, but I'd go with Jim Brown
What we Americans call "Soccer"--Pele
Boxing--Tough choice; Ali or Joe Louis
Golf--Jack Nicklaus up to now, but Tiger could wind up in the top spot eventually