Greatest Athletes of all time by sport?

Question

With Phelps destroying the pool I figured it would be fun to debate the greatest in each sport, I am not going to include Nascar, here is my list

Baseball: Jackie Robinson (Personal preference)

Basketball: Michael Jordan

Football: John Elway (I am from Denver, I think football is too hard to judge)

Hockey: Wayne Gretzky

Soccer: Pele

Tennis:Pete Sampras

Golf:Tiger Woods

Swimming Micheal Phelps

Cycling: Lance Armstrong

Tabke Tennis: Who Cares?

Who do you think should be on the list?

Answer 1

Baseball: Willie Mays

Basketball: Michael Jordan

Football: Johnny Unitas

Hockey: Wayne Gretzky

Soccer: Pele

Tennis: Roger Federer

Golf: Tiger Woods

Swimming: Michael Phelps

Lacrosse: Gary Gait