Roger Federer moves into 14th Wimbledon quarters

Seven-time champion Roger Federer moved into his 14th Wimbledon quarterfinals on Monday with an easy 6-2, 6-3, 7-5 win over American Steve Johnson.

Federer, playing on two days of rest on Centre Court at the All England Club in London, equaled Jimmy Connors' Open-era record. The No. 3 seed from Switzerland also added to his own mark by making it at least to the quarters at a Grand Slam tournament for the 48th time.

The 34-year-old Federer has not dropped a set through four matches. Johnson, 26, was making his debut in the fourth round of a major.

"I would never have thought I would win the first four rounds in straight sets," Federer told the BBC after the match. "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."

Federer will next face No. 9 Marin Cilic of Croatia, the 2014 U.S. Open champion who advanced when fifth-seeded Kei Nishikori of Japan retired from their fourth-round match. Cilic was leading 6-1, 5-1 when Nishikori, who previously had a rib injury, decided to stop the match.

"I now need to play my best tennis. I have Marin Cilic in the next round -- he brushed me off the court in the U.S. Open a few years ago and I hope to get him back," Federer said.

American Sam Querrey, fresh from shocking world No. 1 Novak Djokovic in the third round on Saturday, also advanced to the quarterfinals.

The 28th-seeded Querrey beat Nicolas Mahut of France 6-4, 7-6 (5), 6-4. Querrey is the first American man to reach the Wimbledon quarterfinals since Mardy Fish in 2011.

On the women's side, third-seeded Agnieszka Radwanska of Poland was upset by No. 19 Dominika Cibulkova of Slovakia 6-3, 5-7, 9-7 in the fourth round.

No. 21 Anastasia Pavlyuchenkova of Russia reached her first quarterfinal at Wimbledon by eliminating No. 27 Coco Vandeweghe 6-3, 6-3, breaking the American five times.

Australian Open champion Angelique Kerber of Germany, the No. 4 seed, advanced to the quarterfinals by beating Misaki Doi of Japan 6-3, 6-1.