Jim Courier defeated Carl-Uwe Steeb, 6-3, 1-6, 6-3, and then helped in a doubles victory Wednesday as the United States beat defending champion West Germany, 2-1, in the $1.3-million ATP World Team Cup tournament at Dusseldorf, West Germany.
Boris Becker provided the only West German victory, overpowering Brad Gilbert, 6-1, 6-1.
Courier and Ken Flach beat Becker and Eric Jelen in doubles, 6-2, 6-2.
Spain defeated the Soviet Union, 2-1, on singles victories by Sergi Bruguera and Jordi Arrese.
The United States and West Germany have 4-2 records after three days of the competition.
Americans Lawson Duncan and Todd Witsken won their second-round matches in a $225,000 clay-court tournament at Bologna, Italy.
Duncan upset seventh-seeded Paolo Cane of Italy, 7-5, 6-3, and Witsken downed Martin Strelba of Czechoslovakia, 7-6 (7-2), 6-1.
Top-seeded Guillermo Perez-Roldan of Argentina led the way into the quarterfinals with a 6-0, 6-0 victory over French qualifier Xavier Daufresne.
Second-seeded Swiss Marc Rosset beat Gilad Bloom of Israel, 6-2, 3-6, 6-1, in a first-round match.
Defending champion and top-seeded Manuela Maleeva of Switzerland was upset by Sabine Hack of West Germany, 6-2, 6-1, in the second round of the $150,000 European Open at Geneva, Switzerland.
The 20-year-old Hack, ranked 77th in the world, needed only 70 minutes to eliminate the seventh-ranked Maleeva.
"I am surprised at the score, but I thought I could beat her since she doesn't like my topspin game," Hack said.
Byron Black of USC was the only one of the top four seeded players to be upset in the first round of the NCAA men's championships at Indian Wells.
Black lost to defending champion Donni Leaycraft of Louisiana State, 6-3, 3-6, 6-1.
Top-seeded Todd Martin of Northwestern defeated Eric Fahnestock of Oklahoma State, 7-6 (7-4), 6-4; No. 2 Jonathan Stark of Stanford beat Tim Jessup of Tennessee, 6-1, 6-4, and No. 3 Jose-Luis Noriega of San Diego eliminated David Hopper of South Carolina, 6-2, 6-2.