The best part of Federer's game today is that he's defending very well - which also means, he's been more consistent off the ground than Nole. And has served very well on certain crucial points; that is, if you take a look at the breakpoints Nole has had so far, but failed to capitalize it mainly because of Federer's serve.
Nole finally breaks and holds quickly. 5-2 Nole, 2nd set.