Top-seeded Ivan Lendl beat Michael Stich, 6-2, 7-6 (9-7), despite a spill, and John McEnroe advanced to a match with defending champion Pete Sampras last night in the U.S. Pro Indoor quarterfinals.

On match point in the tiebreaker, Lendl lunged for a return and fell over the net, landing on his back on Stich's side. He got a second match point when Stich hit a forehand long, and won when Stich double faulted.

Lendl moves into today's semifinals against third-seeded Brad Gilbert, who topped Kevin Curren, 4-6, 6-3, 6-0. Gilbert has yet to reach this final in eight appearances.

No. 4 McEnroe beat Aki Rahunen of Finland, 7-5, 6-3. Sampras, seeded second, defeated Petr Korda, 6-4, 6-0. Sampras beat McEnroe twice last season, the second time at the U.S. Open, which Sampras won.

Donnay Indoor: Boris Becker and Stefan Edberg had straight-set quarterfinal victories in Brussels. Becker leads Edberg in the ATP rankings by 133 points; this event is worth 180.

Becker used his dominating serve to top seventh-seeded Michael Chang, 7-5, 6-1. Edberg, using lots of top-spin, defeated Jakob Hlasek, 6-1, 6-2, in less than an hour.

Edberg next plays hard-serving Guy Forget. Forget, No. 11 in the world, won the battle of aces (13-11) and beat Marc Rosset, 6-2, 7-5. Becker plays wild card entry Andrei Cherkasov, who beat No. 6 Andrei Chesnokov, 7-5, 6-1, in a baseline battle.

Virginia Slims of Chicago: Sixth-seeded Helena Sukova used a powerful serve-and-volley game -- 17 service winners and three aces -- to beat No. 4 Jennifer Capriati, 6-4, 6-4, No. 5 Zina Garrison ousted No. 2 Katerina Maleeva, 6-2, 1-6, 6-1, and Helen Kelesi beat No. 7 Amy Frazier, 7-5, 6-3, in quarterfinals.

"Her first serve gave me trouble," Capriati said of Sukova, who next plays Martina Navratilova. "Her slices were hard to return, and she came to the net more than I wanted her to."