BROOKLINE, MASS., JULY 9 -- Tom Nijssen of the Netherlands defeated ninth-seeded Thierry Tulasne of France, 2-6, 6-0, 7-6 (7-1), today to join the top seven seeds in the quarterfinals of the $293,400 U.S. Pro Tennis Championships.

Top-seeded Mats Wilander overcame troubles with his serve tonight to defeat 17-year-old Franco Davin of Argentina, 6-2, 6-2, in 90 minutes. Davin, ranked No. 107, lost his first seven service games.

Nijssen, ranked 148th in the world, made few mistakes and used strong serves to pressure Tulasne. On the fourth point of the tie breaker, Nijssen produced an ace; Tulasne, angered by the call, failed to win another point.

"He hit a lot of heavy topspin balls from the base line, and I'm not too tall {5 feet 9}," Nijssen said. "It was tough for me to return them, but fortunately I served well."

Andres Gomez, the second seed, rebounded from a three-hour match against Mark Dickson Wednesday night to defeat No. 16 Diego Perez of Uruguay, 6-4, 6-4. No. 3 Kent Carlsson of Sweden ousted No. 14 Guillermo Vilas of Argentina, 6-3, 6-2.

"I think Vilas is still fit and moving very good," Carlsson said of his 34-year-old opponent, "so it was a tough match {with} long points."

Play lasted 1 hour 23 minutes.

Fourth-seeded Martin Jaite of Argentina, runner-up to Gomez last year and to Mats Wilander in 1985, defeated Francesco Cancellotti of Italy, 6-2, 6-2. Fifth-seeded Joakim Nystrom of Sweden breezed past Craig Miller of Australia, 6-2, 6-2.

No. 6 Aaron Krickstein of Grosse Pointe, Mich., eliminated Andrew Castle of Britain, 6-1, 7-5. Krickstein, who won at Longwood in 1984 when he was 16 years old, took a 5-0 first-set lead, losing just six points. Castle had never won a Grand Prix match on clay until this week.

Seventh-seeded Jimmy Arias defeated Pablo Arraya of Peru, 7-5, 2-6, 7-5, in 2 hours 30 minutes.

"He seemed to be running down a lot of shots, trying and being excited the whole time," Arias said. "I was too tired to do that until I won the match."