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Roger Federer and John Isner are into the quarter-finals at Wimbledon without dropping serve.

Federer, Isner, Serving ‘Lights Out’ At Wimbledon

Neither player has lost serve entering the Wimbledon quarter-finals

It’s not too often that a player gets through four consecutive best-of-five-set matches without dropping serve. Yet both top seed Roger Federer and ninth seed John Isner are into the quarter-finals at Wimbledon without getting broken in any of their matches.

Federer has been nearly spotless on serve throughout his first four matches, facing just four break points and winning 91.6 per cent of first-service points. The eight-time Wimbledon champion had not faced a break point before beating Adrian Mannarino in the fourth round. But while he faced his first break points of the tournament, Federer still won 78 per cent of service points.

The 6’10” Isner arrived at the All England Club leading the ATP World Tour by winning 93.6 per cent of his service games. He has only faced six break points on the hallowed grass and saved them all en route to his first Grand Slam quarter-final since the 2011 US Open. In the second round, he saved two match points on his serve in the fifth set of his triumph against Ruben Bemelmans.

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The American has hit 134 aces, which is not all that surprising considering he is third all-time in that department with 10,363 aces. But what’s impressive is that he has only played 319 points on his first serve in the tournament, meaning that he has hit an ace on 42 per cent of those points. The 33-year-old says he has enjoyed the quickness of the surface.

“It helps my serve a lot. But I like my serve in any conditions. Play in mud, I like my serve,” Isner said after his first-round victory. “[Playing on] grass courts definitely give it a little bit extra boost. It skids through. My big serves in essence feel even bigger when I make it, and it's shooting through the court. Grass has always been a good servers' surface, and it's always been one for me.”

Federer next faces eighth seed Kevin Anderson and Isner plays No. 11 seed Milos Raonic. If they both win again, they will play one another in the semi-finals.