Life could hardly be better for Roger Federer. He is the father to a second set of twins, he is two matches away from winning a record-breaking eighth Wimbledon title and he will not have to play his tormentor-in-chief, Rafael Nadal, in his semi-final on Friday. Rest assured, he would have taken that scenario at the start of the fortnight. Federer said it would have been “cool” to play Nick Kyrgios, if only so he could thank the teenager for blasting Nadal all the way to the beach, and he spent a fair chunk of his post-match press conference checking how the Australian was getting on against Milos Raonic. Not well, it turned out. “Oh, it’s Raonic now,” Federer said, spotting that Kyrgios had lost in four sets, but he will be confident of handling the Canadian’s big serve. It will be a shock if Federer loses to Raonic but Wimbledon has seen a few this week, Kyrgios playing above his years against Nadal and Grigor Dimitrov dismantling Andy Murray. Yet Federer refused to succumb to the growing volatility, winning his all-Swiss quarter-final against Stan Wawrinka 3-6, 7-6, 6-4, 6-4. Theirs has often felt like a brotherly rivalry. For years,…