Football -- Barry Sanders
Baseball -- Barry Bonds
Basketball -- Michael Jordan
Hockey -- Wayne Gretzky
Soccer -- honestly have not seen enough to give an educated guess
Golf -- Tiger Woods
Tennis -- Roger Federer
Boxing -- Mike Tyson (in his heyday)
Track & Field -- Carl Lewis
Horse Racing -- same as soccer, maybe one of Baffert's horses that just missed the Triple Crown, but I don't know much about their entire careers (Lafit Pincay for jockey, no?)
Cycling -- Lance Armstrong
OVERALL best athlete I've seen in my lifetime -- MICHAEL JORDAN
Baseball -- Barry Bonds
Basketball -- Michael Jordan
Hockey -- Wayne Gretzky
Soccer -- honestly have not seen enough to give an educated guess
Golf -- Tiger Woods
Tennis -- Roger Federer
Boxing -- Mike Tyson (in his heyday)
Track & Field -- Carl Lewis
Horse Racing -- same as soccer, maybe one of Baffert's horses that just missed the Triple Crown, but I don't know much about their entire careers (Lafit Pincay for jockey, no?)
Cycling -- Lance Armstrong
OVERALL best athlete I've seen in my lifetime -- MICHAEL JORDAN