Ask 100 people...

...who is the greatest sportsperson of all time and three will answer Cassius Clay, 96 Muhammad Ali and one ANother, for example Zatopek, Bannister, Laver, Borg, Navratilova, Redgrave, Schumacher, Joyner-Kersee, Phelps, Federer, Bolt, Jordan, Pele, Woods, Messi, Nicklaus, Warne, Comaneci, Sobers, Campese, Indurain, Moses, Best or Lottie Dod (please Google her) ...….......space for your own choice.