http://sports.espn.go.com/espnmag/story?id=3297734
A month ago, during simpler times, Tiger Woods was presented with a tricky question: Who would he pick as the athlete of the decade?
Plenty of possible choices - Lance Armstrong, Roger Federer, Kobe Bryant, Barry Bonds, Tom Brady, among them. Tiger, too. Told the list of candidates, and leaving himself out of the mix, Woods contemplated their merits for two holes during a pro-am in China before he finally found himself torn between Federer and Bonds.
http://www.winnipegfreepress.com/sports/baseball/78689912.html
Well, since Tennis is tougher to play than Basketball or Baseball, I would go for Federer.
On what basis? Basketball is a physically more taxing sport, while Baseball requires just as much if not more eye hand coordination.