Roger Federer has seen off Uzbekistan's Denis Istomin in straight sets to become the first player to reach the quarter-finals of the men's singles at London 2012.
In a tough opening set, the Swiss top seed broke twice to take it 7-5 on Wimbledon's Court 1.
The second was more straightforward for the Wimbledon champion as he broke once to claim it 6-3.
Federer's win has seen him set up a quarter-final clash with either American 10th seed John Isner or Serbia's seventh seed Janko Tipsarevic.