SEVEN-time champion Roger Federer reached the quarter-finals by dismantling Steve Johnson 6-2 6-3 7-5.
The 34-year-old was imperious as he set up a meeting with 2014 US Open champion Marin Cilic as he hunts a record-breaking eighth men’s singles title.
“I would never have thought I would win the first four rounds in straight sets,” Federer said.
“The matches may be tough, but rests are great for professional athletes, that’s huge.
“You can always lose a tournament in the first week, but never win it.
“I now need to play my best tennis. I have Marin Cilic in the next round, he brushed me off the court in the US Open a few years ago and I hope to get him back.”
Fifth seed Kei Nishikori and seventh seed Richard Gasquet retired from their fourth-round matches because of injuries.
Japan’s Nishikori, 26, struggled with a rib problem before halting his match against Marin Cilic with Cilic winning 6-1 5-1.
Gasquet appeared to hurt his back reaching for a shot at 3-2 down against fellow Frenchman Jo-Wilfried Tsonga. He retired at 4-2 and 40-0 down against the 12th seed, who carried his friend’s bag off as the two departed the court.
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