NEW YORK (AP) American teenagers Melanie Oudin and Jack Sock won the U.S. Open mixed doubles title Friday night, beating eighth-seeded Gisela Dulko and Eduardo Schwank of Argentina in a tiebreak.

Oudin and Sock won 7-6 (4), 4-6, 10-8 (tiebreak) in front of a sparse crowd at Arthur Ashe Stadium after the men's singles quarterfinals.

The 19-year-old Oudin was the darling of the 2009 U.S. Open, reaching the women's quarterfinals. The 18-year-old Sock earned his first Grand Slam singles victory in the first round this year before being eliminated by Andy Roddick.

The two needed a wild card to get into the tournament, then upset top-seeded defending champs Bob Bryan and Liezel Huber in the second round.