Sam Querrey beat Thomaz Bellucci 6-3, 6-4, 6-4 in the first match to give the U.S. a 1-0 lead over Brazil in the first round of the Davis Cup on Friday at Jacksonville Veterans Memorial Arena.
About 3,000 fans attended the afternoon match, but Querrey expects a major draw for Saturday's doubles match.
"This could be your one chance to see the greatest doubles team of all time," Querrey said.
Bob and Mike Bryan will face Marcelo Melo and Bruce Soares on Saturday. The Bryan brothers are ranked Nos. 1 and 2 in doubles and are the most prolific doubles team in men's tennis history, having won the Australian Open last week for their record 13th Grand Slam title.