John Isner and Sam Querrey each won their matches on Friday to give the United States a 2-0 lead over Brazil in the first round of the Davis Cup.
Isner earned a straight-set win over Brazil's Thiago Alves 6-3, 7-6 (4), 6-3.
Isner's win came two hours after Querrey earned a 6-3, 6-4, 6-4 victory over Thomaz Bellucci.
The United States is one win away from advancing. Bob and Mike Bryan, the world's No. 1 ranked doubles team, will take on Brazil's Marcelo Melo and Bruno Soares on Saturday, followed by Sunday's reverse singles.
Taking 2-0 leads in other first-round series were: Serbia (over Belgium), France (over Israel), Kazakhstan (over Austria) and Argentina (over Germany). Tied 1-1 were Switzerland-Czech Republic and Croatia-Italy. The other series is Canada vs. Spain.
Novak Djokovic swept past Oliver Rochus 6-3, 6-2, 6-2 in Serbia's second victory in Charleroi, Belgium. Djokovic was coming off his third straight Australian Open title. Despite the switch from hard courts to slo...