American teenager Melanie Oudin has continued her upset streak against higher-ranked Russian players to advance to the quarterfinals of the U.S. Open tennis tournament in New York.

The 17-year-old upstart rallied to knock off 13th-seeded Nadia Petrova, 1-6, 7-6, 6-3 on Monday.  Previously at the tournament, Oudin upset 2006 champion Maria Sharapova and fourth-seeded Elena Dementieva.

In men's competition, top seed and defending champion Roger Federer of Switzerland reached the quarterfinals with a 7-5, 6-2, 6-2 win over Tommy Robredo of Spain.  Federer will play Robin Soderling of Sweden.

The French Open finalist advanced to his first quarterfinal appearance at the U.S. Open, after eighth-seeded Russian Nikolay Davydenko retired with a leg injury with the number-12 Swede ahead, 7-5, 3-6, 6-2.  Federer comes into the match with an 11-0 career record against Soderling.
Earlier, Kateryna Bondarenko of Ukraine advanced to the quarterfinals with a 6-0, 6-0 win over Argentina's Gisela Dulko that took just 47 minutes.  The victory avenged her sister Alona's loss straight-sets loss to Dulko in the second round.

Some information for this report was provided by AFP and AP.