World No. 1 Boris Becker and No. 2 Stefan Edberg moved a step closer to a clash in the $600,000 Donnay men's tennis tournament Friday, both reaching the semis with straight-set victories.

Becker, the No. 1 seed, downed American Michael Chang 7-5, 6-1. He'll meet Soviet wild-card Andrei Cherkasov in today's semifinals.Edberg trounced Jakob Hlasek of Switzerland 6-1, 6-2 to line up a semi with Guy Forget of France.

Forget, the No. 4 seed, played tough serve-and-volley tennis to overcome Marc Rosset of Switzerland 6-2, 7-5.

Becker and Chang were level at 5-5 in the first set when the German got the crucial service break and went on to take the set 7-5.

Becker needs the 240 ATP points he would earn from a tournament win to stay ahead of Edberg, who was No. 1 before the Australian Open and who is just 133 points behind.

Cherkasov fought back from a 3-1 deficit to upset fellow Soviet Andrei Chesnokov, the sixth seed, 7-5, 6-1.

Cherkasov leveled at 3-3 in the first and took the opening set with a break in the 12th game. In the second set, his attacks from the net shut down Chesnokov's game, and he won the match in 90 minutes.

Right-hander Rosset and leftyForget exchanged cannonball serves, which made this quarterfinal a quick 67-minute encounter where Forget finally proved better at the return. Rosset was unable to score a single breakpoint on Forget's 10 service games.

"The Swiss counted on many hard returns and plenty of aces. He put too much pressure on himself," said Forget.Fifth seed Zina Garrison rallied for a 6-2, 1-6, 6-1 victory to defeat No. 2 seed Katerina Maleeva and reach the semifinals of the $350,000 Virginia Slims of Chicago.

Garrison, of Houston, who won the event in 1989, will face upstart Helen Kelesi of Canada in Saturday's semifinals.

Top seed and 10-time Chicago champion Martina Navratilova also reached the semifinals with a 6-1, 6-2 win Thursday night over Anne Smith of Dallas. Navratilova will face the winner of Friday's late match between 14-year-old Jennifer Capriati, the fourth seed, and No. 6 seed Helena Sukova.

Garrison said she did not play aggressively in the second set of the seesaw match against Maleeva, ranked No. 7 in the world.