Simon, whose match was interrupted by a lengthy rain delay, eliminated French countryman Guillaume Ruffin 6-4, 6-3. Simon won 57 percent of the points on serve and more than half (22-20) off Ruffin's serve to advance to the quarterfinals.
Querrey beat Sergiy Stakhovsky 7-5, 6-3 by saving six of the seven break points he faced. He had three breaks on the day, including the only one in the second set to take a quarterfinal spot.
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