Five-time champion Roger Federer sailed into the quarter-finals at the US Open by beating Austria's Jurgen Melzer 6-3, 7-6, 6-3.
The Swiss second seed now faces a clash with Sweden's Robin Soderling, who ended Federer's run of 23 consecutive Grand Slam semi-finals at the French Open earlier this year.
Federer admitted: "I expect it to be really tough, especially now that he's gotten a taste of how to beat me. It's up to me to clean up my game and put in a good performance.
"He's been able to string together a few good years now on the tour. Before he was very good already, but he was a bit up and down.
"Maybe that's also maybe why his ranking was a bit lower. Now he is playing really well.
"Like against any big server you try to read the serve, get into good baseline rallies, try to move him around, just play a solid match and have no hiccups on your own serve."
Also into the last eight are Gael Mofils and Novak Djokovic, who enjoyed comfortable wins over Richard Gasquet and Mardy Fish respectively.
In the women's draw, top seed Caroline Wozniacki saw off Maria Sharapova 6-3, 6-4, while Kaia Kanepi, Vera Zvonareva and Dominika Cibulkova also progressed to the last eight.