Chinese Rookie Jie Zheng reached the third round of the French Open when she shocked 31st seed Emilie Loit.
Zheng, 21, who made her Grand Slam debut with a first round defeat at the Australian Open, crushed her more experienced opponent 6-4 6-1.
She meets Tathiana Garbin in the third round after the Italian's stunning win over top seed Justine Henin-Hardenne.
Zheng became just the third Chinese woman to reach the third round at a Grand Slam tournament.
LI Fang reached the third round of the 1992 Australian Open and YI Jingqian repeated the feat at the 2000 Australian Open.
Zheng put her improved form down to a new openness and increased government investment in Chinese tennis in the run-up to the 2008 Beijing Olympics.
"Before the government didn't pay too much attention to tennis," said Zheng through a translator.
"Now we have more opportunity to play outside China. Tennis is getting better than before and this is because the training conditions are getting better and better," she explained.
American Meghann Shaughnessy was celebrating after beating number 15 seed Silvia Farina Elia, 6-3 3-6 9-7.
Fifth seed Lindsay Davenport had few problems in seeing off Spain's Maria Sanchez Lorenzo 6-4 6-1.
It was a good day for the Russians, with eighth seed Nadia Petrova, 10th seed Vera Zvonareva and 18th seed Maria Sharapova all reaching the third round.
It was not all good news, however, as their compatriot Dinara Safina lost 6-7 2-6 to Marissa Irvin.
In another second-round upset, Spaniard Aranxta Parra Santonja beat American Lisa Raymond, the 28th seed, 6-4 6-0.