PURCHASE, N.Y. (AP) _ Guillermo Vilas upset second-seeded Mansour Bahrami 6-3, 6-3 Tuesday night in the opening match of the sixth annual $200,000 Citibank Champions senior tennis tournament.

Vilas won the last three games of the opening set, then rallied from an 0-2 deficit in the second set, winning the last five games in the clay court event.

The victory puts Vilas into the quarterfinals where he will play the winner of a first-round match between Andres Gomez and Mel Purcell.