Roger Federer put a hurtin’ on Rafa Nadal 6-3, 6-0 in their round robin match at the ATP Barclay’s World Tour Finals (Masters) 2011. With that convincing win, Federer was guaranteed a berth in the semifinals whether he wins or loses tomorrow against Mardy Fish (6am pst Tennis Channel). In the semis, he will face the #2 player from Group A, which is still undecided. David Ferrer leads that group with two convincing wins over Andy Murray and Novak Djokovic. Djokovic suffered only his fifth loss of the season today versus the tenacious Spaniard 6-3, 6-1.