Former champion Albert Costa of Spain and Nicolas Lapentti of Ecuador won semifinal matches in the Swiss Open yesterday in Gstaad.

Costa, who won the title in 1996, advanced with a 4-6, 7-6 (7-5), 6-3 comeback victory over Morocco's Younes El Aynaoui. Lapentti upset fifth-seeded Spaniard Felix Mantilla, the 1997 champion, 6-4, 4-6, 7-5.

Lapentti got off to a strong start, stunning Mantilla with a pair of breaks to take the first set.

For a while it seemed the more experienced Mantilla would make a comeback, when he won the second set and broke Lapentti's serve to go up 5-4 in the third.

But, the Spaniard was unable to hold serve, allowing Lapentti to break back twice for the victory.

"I just kept fighting," said Lapentti, ranked 26th in the world. "I played Felix twice before but always lost because he put in more effort. This time, I gave everything I had and it paid off."

Both finalists are considered good high-altitude players, with Lapentti from Quito, Ecuador, high in the Andes, and that has been useful in this tournament.

Spaniards have traditionally done well at this clay-court tournament, winning the title seven times in the last eight years with only Russia's Yevgeny Kafelnikov interrupting the streak in 1995.

In fact, Spaniards have been in every final but two over the last decade, including five all-Spanish finals.

* SWEDISH OPEN: Wild-card entry Andreas Vinciguerra advanced to his first ATP final as he beat fifth seed Christian Ruud of Norway, 6-3, 6-3, in Bastad.

Vinciguerra, 18, playing only a few hours drive from his home town in southern Sweden, will face Spaniard Juan Antonio Marin in today's title match.

Marin eliminated another Swedish wild card, Nicklas Kulti, 2-6, 7-6 (11-9), 6-4, in the other semifinal.

* HALL OF FAME: American Chris Woodruff finally broke the unbreakable serve and defeated Wayne Arthurs, 7-6 (7-4), 6-7 (7-5), 6-4, to reach the final in Newport, R.I. He will face Kenneth Carlsen, the Danish left-hander who defeated Laurence Tieleman, 7-6 (8-6), 6-1, in the other semifinal.