Powerhouse teen phenomenons Melanie Oudin and Caroline Wozniacki rallied on Monday to complete an ouster of Russian stars from the US Open and advance to their first Grand Slam quarter-finals.

The unseeded Oudin, who turns 18 on September 23, ousted 13th seed Nadia Petrova 1-6, 7-6 (7/2), 6-3. It was her third triumph in a row after losing the first set to a seeded Russian rival.