MELBOURNE, Australia (AP) — The crowd was still buzzing about the comeback victory by “Aussie Kim” Clijsters, and the fans dressed in canary yellow were now in full voice for another one of their own.Then along came Roger Federer to flatten their hopes.Federer has won four of his record 16 Grand Slam singles titles on Rod Laver Arena, and on Sunday night he more or less held a clinic — a 6-4, 6-2, 6-2 victory over Bernard Tomic to reach the quarterfinals for a 31st consecutive major.He played the 19-year-old Aussie at his own game, but raised it a level: mixing soft, angled drop shots that just cleared the net with crisp groundstrokes that hit the lines and — for good measure — a leaping, backhand overhead.“It was like boxing in the beginning. You don’t want to take too many chances,” Federer said, explaining why there weren’t any service breaks until the ninth game, when he produced two drop shots for winners with Tomic stranded in the backcourt. “Had one game when I was starting to feel better, next thing you know I’m up a break.