Laura Robson: "I knew it would be tough"

British hopeful Laura Robson has admitted that she knew facing eighth seed Petra Kvitova "would be tough" but was delighted with her second-round win.

Robson went a set down but came back to win an epic in three sets, 2-6 6-3 11-9, finally breaking in the 19th game of the last set.

She has pointed to her serve as a big reason for the win.

"I knew it was going to be really tough, I always struggle to play lefties anyway," The Metro quotes Robson as saying.

"I knew once I got my returns firing and had more confidence in my serve I would get into the match and that's what I managed to do."

Robson will face American 29th seed Sloane Stephens in the third round.