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German second seed Tommy Haas advanced to the quarter-finals of the $455,775 ATP Delray Beach International Championships on Thursday but US third seed Sam Querrey was eliminated.
Haas ousted Uzbek Denis Istomin 6-4, 6-1, moving on in 67 minutes without facing a break point, while Latvian qualifier Ernests Gulbis outlasted Querrey 6-4, 4-6, 7-6 (7/4).
Next for Haas will be a Friday quarter-final against Croatian Ivan Dodig, who downed Russia's Evgeny Donskoy 6-3, 7-5.
Gulbis will face fellow qualifier Daniel Munoz, a Spaniard who outlasted Belgium's Xavier Malisse 7-6 (7/3), 3-6, 6-3 to reach the last eight in a match that was halted Wednesday in the first set by rain.
Lithuanian lucky loser Ricardas Berankis advanced by rallying to defeat American Jack Sock 3-6, 6-4, 6-1. His next foe is France's Edouard Roger-Vasselin, who eliminated Croatian Ivo Karlovic 6-4, 7-5.
US top seed John Isner was to face Japan's Go Soeda in a night match with the winner to face either South African sixth seed Kevin Anderson or Taiwan's Lu Yen-Hsun on Friday.