His attacking style had given Murray problems from the start and, after saving four break points in game two, he broke serve in the following game and moved impressively to 5-2 with six aces and 20 winners.

BBC: Stanislas Wawrinka beats Andy Murray at US Open

Top-seeded Petrova hit seven aces in beating Zheng Jie of China 6-2 6-3 in the third round in Florida.

BBC: SPORT | Tennis | Petrova and Williams both advance

And Andy Roddick took less than an hour to dispatch Juan Carlos Ferrero 6-2 6-4, serving 18 aces and conceding just 11 points on serve.

BBC: SPORT | Tennis | Nadal struggles to win in Dubai

But the United States hit back to level the tie as big-serving John Isner fired nine aces in a straight-set 6-3 6-2 7-5 win over Gilles Simon.

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Reigning Wimbledon champion Maria Sharapova hit two aces and 15 winners to beat Angela Haynes 6-1 6-2 and reach the third round.

BBC: SPORT | Tennis | Clijsters eases into third round

But 30-year-old Llodra took control at the net to claim the next two sets before two straight aces in the fourth-set tie-breaker helped him put France 2-0 up and loosen Spain's two-year grip on the cup.

BBC: France take shock Davis Cup lead over Spain

The Flushing Meadows crowd had much to cheer about on Louis Armstrong as 19th seed Mardy Fish , a recent finalist at the Cincinnati Masters, fired 14 aces on his way to an impressive 7-5 6-0 6-2 win over Uruguay's Pablo Cuevas.

BBC: Roger Federer wins at US Open as Davydenko & Cilic lose

American John Isner served up 20 aces as he stunned French third seed Jo-Wilfried Tsonga 4-6 7-6 (7-2) 7-6 (7-4) despite a brief break for rain.

CNN: Roddick victorious on return from injury