Top seed Federer absolutely dominated German Phau to win 6-2 6-3 6-2 in the opening match of Thursday's night session before paying tribute to Roddick, who he defeated in three Wimbledon finals.
"A great champion and a great guy," Federer told the crowd. "I hope you guys make it hard for Tomic tomorrow night. I'm going to be watching."
In Image: Roger Federer, of Switzerland, looks up at a replay during a match against Bjorn Phau, of Germany, at the U.S. Open tennis tournament on Thursday, Aug. 30, 2012, in New York.