Losing the first set 4-6 was something of a recovery by Nalbandian after del Potro had stolen his first two service games for a 3-0 lead, but in the second set he was simply overpowered.

In the first match of the day, French world No. 16 Gilles Simon came back from two match points down to beat Robby Ginepri 6-7, 6-4, 7-6 in an enthralling 2 hour 36 minute duel against the American qualifier ranked 63 in the world.

On Wednesday, Roger Federer advanced to the third round with a 6-3, 7-6 win over Czech Radek Stepanek on his return from a three-week break.

Serbian third seed Novak Djokovic survived a searching test to beat Romanian Victor Hanescu.

Initially Federer had no such concerns, romping to a 3-0 lead as Stepanek's serve fell apart.

But the world No. 30 stepped up in the second set, winning all but one of the points on his first serve, and seized the advantage in the set decider with a sensational drop shot, before pumping his first wildly in celebration.

Two points later he had even greater impetus as he took a 5-3 lead but could not hold on as Federer applied the pressure to take the tie break 8-6 and win 6-3, 7-6 in one hour and 26 minutes.

【体坛英语资讯：Murray wins but Nalbandian departs】相关文章：

★ 娱乐英语资讯：Rock and Roll Hall of Fame inducts Madonna,Cohen

★ 娱乐英语资讯：Pink and racer hubby Carey Hart split up

★ 体坛英语资讯：China Open: Gonzalez hard tested, host players out

★ 体坛英语资讯：China beats Poland in womens basketball friendly

★ 体坛英语资讯：China, Indonesia share light at badminton worlds

★ 娱乐英语资讯：DiCaprios Romeo and Juliet tops movie tear-jerkers list

★ 娱乐英语资讯：Moss expects second sell out

★ 娱乐英语资讯：Paris tones down the bling

★ 体坛英语资讯：Another injury sends Yi to NBA sidelines

★ 娱乐英语资讯：Depp persuaded to become star by pal Cage