Pete Sampras predicts Roger Federer still has a few more Grand Slam titles to win despite his recent loss in the U.S. Open final. "Roger is going to win some more majors. Maybe he's not going to be quite as dominant as he once was," Sampras told a media conference in Hong Kong Tuesday via telephone from Los Angeles. The seven-time Wimbledon champion was promoting his upcoming exhibition match against Andre Agassi in the nearby southern Chinese gambling enclave of Macau on Oct...