Sergio Casal, ranked 52nd in the world, upset second-ranked Boris Becker, 6-2, 0-6, 6-2, 6-3, Sunday to lift Spain to a 3-2 victory over West Germany in a first-round Davis Cup match.
Earlier Sunday, Spain's Emilio Sanchez defeated Eric Jelen, 8-6, 6-3, 6-2, to even the match, 2-2.
Casal was in command except for the second set, when he made numerous unforced errors.
The Spaniard broke Becker's serve three times while winning the first set and regained his composure after Becker pulled even.
With the home fans chanting "Sergio, Sergio," Casal took the match when Becker failed to return a lightning serve.
"In the second set things did not go well for me, but in the third I began using the same tactics as in at the start of the match, and got a good result," Casal said.
An estimated crowd of 5,000, including 600 who traveled from West Germany, watched the matches played on the clay court of the Royal Tennis Club of Barcelona.