Isner crashes out in Memphis

Top seed John Isner suffered a surprise straight-sets defeat by Austria's Jurgen Melzer in the quarter-finals of the Memphis Open.

Querrey also out on a bad day for Americans

Top seed John Isner suffered a surprise straight-sets defeat by Austria's Jurgen Melzer in the quarter-finals of the Memphis Open. The giant 26-year-old American's serve let him down in the first set as he was broken twice, and Melzer took the second on a tense tie-break to complete a 6-3 7-6 (8/6) win. Third seed Radek Stepanek awaits in the last four after dumping out Sam Querrey in straight sets to end American interest in the tournament. The Czech required a tie-break to take the opening set but swept through the second to win 7-6 (7/5) 6-0. Big-serving Canadian Milos Raonic, seeded fourth, took his place with a straight-sets win over Olivier Rochus. The diminutive Belgian, giving away 11 inches in height to his young opponent, did well to hang in the match in the face of a barrage of 26 aces - to his three - but was beaten 6-3 7-6 (7/3). Germany's Benjamin Becker is next in Raonic's sights after a hard-fought 7-5 7-6 (7/5) win over Lukasz Kubot which lasted over two hours.