The United States rode a doubles victory by twins Bob and Mike Bryan on Saturday to a 2-1 lead over Chile in the first round of the Davis Cup.
The top-ranked Bryans defeated Jorge Aguilar and Nicolas Massu 6-3, 6-3, 7-6 (4). The U.S. can reach the quarterfinals by winning one of Sunday's reverse singles. Andy Roddick can clinch it for the Americans when he opens against Paul Capdeville.
The winner of the best-of-five series faces Spain, which eliminated Belgium 3-0.
The Bryans breezed through the first two sets but trailed in the third when Bob Bryan's serve was broken in the fifth game. The brothers broke back in the 10th to make it 5-5. They won on their second match point of the tiebreaker when Massu netted a forehand.
Elsewhere in the first round of the World Group, Argentina (over Romania) and Sweden (over Russia) advanced to the quarters on 3-0 victories. Ahead 2-1 were France (over Austria), Germany (over Croatia) and Serbia (over India). The Czech Republic and Kazakhstan were tied 1-1.