Li Na and Agnieszka Radwanska beat the rain to reach the second round of the US Open at a stormy Flushing Meadows.

Third seed Radwanska had a tough second set against Maria-Teresa Torro-Flor but came through 6-0 7-5 while fifth seed Li defeated Sweden's Sofia Arvidsson 6-2 6-2.

Dark clouds were gathering before the pair were off court, and not long afterwards play was suspended because of the threat of lightning.

Soon heavy rain was falling, and organisers announced there would be no play before 2.30pm local time (7.30pm Irish time).

Li said: "I was so lucky before the rain came that I finished the match so I don't have to wait and warm up and come to the court again. It is tough for (everyone else).

"For me, I'll just relax for the rest of the day and do whatever I want to do."

Li could play 30th seed Laura Robson in the third round in a repeat of last year's clash at the same stage, which was won by the British teenager.

Robson was just about to start her clash with France's Caroline Garcia when play was stopped.

Play began on the show courts around two hours after it had been suspended, but it was only a brief window before the rain began to fall again.

Venus Williams managed just two points of her match against Zheng Jie on Louis Armstrong, while Robson and Garcia's court had just finished being dried when the rain returned.