Top-seed Andy Roddick and defending champion Sam Querrey advanced Thursday to the quarterfinals at the Regions Morgan Keegan Championships with straight set victories.
Roddick, a two-time Memphis champion, defeated Serbia's Janko Tipsarevic, 6-1, 7-6(8) and Querrey won 6-3, 7-6(3) over Brian Dabul to reach the quarterfinals for the fourth time in five Memphis appearances.
After winning the opening set easily against Tipsarevic, who upset Roddick in a second-round match at the U.S. Open last fall, Roddick had to survive two set points in the second-set tiebreaker, winning the match when Tipsarevic netted a forehand to end a long rally.
Querrey entered the $1.1 million ATP Tour event having dropped six straight matches dating to mid-October and was 0-3 this year.
