Football (soccer) and basketball are the most played professional sports.
Not sure about other sports, but since this is a baseball forum I Can tell you the MLB record is 12, held by Mike Morgan and Ron Villone.
If your an athlete you can do many sports but it is most associated with running.
Ladainion Tomlinson has sold the most jerseys out of any professional football player but i am not sure about all of sports.
professional athlete
football{soccer} is the most popular sport there
Tiger Woods!!
shawn kemp
Bill Russell - 11
Utah is not popular in sports... John Stockton.
Kobe Bryant
Steve Prefontaine