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Roger Federer equalled the record for most grand slam singles wins as he defeated Steve Johnson to reach the quarter-finals of Wimbledon.
Federer overcame the American 6-2 6-3 7-5 to equal Martina Navratilova's record of 306 victories in major competitions and set up a quarter-final clash with Marin Cilic.
Bidding for his eighth win at SW19, Federer saved an early break point before breaking Johnson in the sixth and eighth games on his way to taking the first set.
He was not at his best in the second set but he managed to break Johnson in the fourth game and never looked in danger of dropping his own serve.
Johnson broke Federer early in the third but the Swiss immediately recovered the game to get the set back on serve. He broke for a second time at 5-5 to all but end Johnson's hopes and he served out to remain on course for an 11th Wimbledon final.
"I would never have thought I would win the first four rounds in straight sets. The matches may be tough, but rests are great for professional athletes - that's huge," Federer, who has yet to drop a set, said.
"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."
Next up for Federer is a quarter-final meeting against Cilic, who booked his place in the last eight when Kei Nishikori was forced to retire due to injury.
Nishikori suffered a rib injury before the start of the tournament and he looked to be in pain during the early stages of Monday's match.
Cilic was 6-1 5-1 ahead when Nishikori finally gave up at the request of his coach Michael Chang.
"It's been not recovering well these two weeks. After the third round it got worse. Today I was hoping to get better but it was too much pain on the court so I couldn't really compete today," Nishikori explained.
"I was thinking about it in the second set and even before the match I knew it wasn't going to be easy to play 100 per cent. Every point I played it got worse. I didn't want to but I had to retire."
In the women's draw, Dominika Cibulkova defeated Agnieszka Radwanska 6-3 5-7 9-7.
Cibulkova had the opportunity to seal victory in the tenth game of the second set, but she made a number of errors to allow Radwanska to hold serve before breaking her opponent to take the match into a third set.
Both players tried to throw away the match as there were five breaks of serve in the final set but a third break of serve proved to be Radwanska's undoing as Cibulkova booked her place in the next round.
Elsewhere, Australian Open champion Angelique Kerber will face Simona Halep.
Kerber needed just over an hour to defeat Japan's Misaki Doi 6-3 6-1, while Halep overcame Madison Keys 6-7 (5/7) 6-4 6-3.