Clearly the man is in a slump and wants to do some spring cleaning. Volandri and Canas have found a way into his head (Volandri with one win, and Canas with two), and he still can’t penetrate the Nadal bubble (with 1 loss; two if you count the Battle of the Surfaces). Plus there was that loss to Roddick in Kooyong.
But if you think it’s a bad move to sack your coach two weeks before a Grand Slam, you need not worry for this Swiss: he won three Grand Slam titles after splitting with Peter Lundgren in 2003.
Edit: Josh at Fagistan pointed out that Canas has beaten Federer twice.
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