I spent the Thursday night's men's semifinal moving back and forth between a seat in Laver Arena and my seat in the pressroom, where I watched on the TV monitor in front of me. Live impressions mixed with a little of the television commentary is the ideal combination for getting your thoughts together about a match.Doing a guest stint as a commentator for Australia’s Channel 7 was Pat Rafter. As the dazzling first set between Roger Federer and Novak Djokovic unfolded, Rafter said what a pleasure it was to sit in the stadium and see these guys first-hand. He saved his highest praise for Federer. Rafter, like so many other ex-pros who marvel at what the Swiss maestro can do,