Lithuanian Ricardas Berankis recorded an upset with a second round win over Russian Igor Andreev in the Farmers Classic in Los Angeles.
Berankis recorded a 6-4 7-5 victory to reach the quarter-finals where he will be joined by Belgium's Xavier Malisse who beat Australia's Matthew Ebden 6-4 6-3.
France's Nicolas Mahut, the fourth seed, was a 7-5 7-6 (9/7) winner against Italian Paolo Lorenzi.
Australian Marinko Matosevic, seeded six, won 6-3 1-6 6-0 against Germany's Tobias Kamke.
In the night game American Michael Russell beat French top seed Benoit Paire 7-5 6-4.