Laura Robson set up a third-round rematch with Li Na at the US Open with an impressive victory over fellow teenager Caroline Garcia.
Twelve months ago Robson followed up her defeat of Kim Clijsters by beating former French Open champion Li to reach the fourth round of a grand slam for the first time.
Rain held up Robson and Frenchwoman Garcia for almost five hours but the 19-year-old British number one produced a very composed display to win 6-4 7-6 (7/5), saving two set points in the second set.
It was an interesting contest on paper between two 19-year-olds who could be contending for major honours in the not too distant future.
Garcia was tipped as a future world number one by Andy Murray when she almost upset Maria Sharapova at the French Open two years ago.
But it is Robson who has made the greater strides so far, with Garcia only ranked just inside the top 100.
The British teenager is seeded at a grand slam for the first time and looked good in her first-round win over Lourdes Dominguez Lino.
The only real improvement she needed to make was in her serving after throwing in eight double faults in that match, and it was mission accomplished here.
Both players possess big serves and used them to great effect - Garcia did not drop a point in her first three service games, sending down one ace at 114mph.
When Robson did get the ball back in play, she was having a lot of success, her greater weight of shot helping her dictate a lot of the rallies.
She could not capitalise when she had Garcia at 0-30 in the eighth game, but two games later she put pressure on the Frenchwoman and won four points in a row to take the set.
It was the first break point of the match, and Garcia angrily slapped her racket down after drilling a backhand wide.
Robson had missed her previous three tournaments because of a right wrist problem and she took a medical timeout at the end of the set to have it retaped.
It did not appear to be hampering her, though, and the dominance of serve continued in the second set right up until Robson was broken in the 11th game.
It was out of the blue, with the Londoner choosing an inopportune moment to serve her first double fault of the match.
That gave Garcia the chance to serve for the set, and she had two chances to take it but threw in a double fault of her own and Robson blasted her way to a break back.
Garcia won the first two points of the tie-break but Robson quickly levelled and made it six points in a row to bring up four match points.
She double-faulted on the first, and Garcia played two of her best points of the match to save numbers two and three.
There was one chance left and this time Garcia could only put a return long.