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The United States trails Serbia 2-1 in a Davis Cup quarterfinal after the top-ranked doubles team of Bob and Mike Bryan lost to Serbia's Nenad Zimonjic and Ilija Bozoljac 7-6 (5), 7-6 (1), 5-7, 4-6, 15-13 on Saturday.
Richard Gasquet of France has been replaced by Gilles Simon for singles on Friday against Argentina in the Davis Cup quarterfinals.
John Isner will play top-ranked Novak Djokovic in the first match Friday of the Davis Cup quarterfinal between the United States and Serbia.
U.S. Davis Cup captain Jim Courier plans to face No. 1 Novak Djokovic and Serbia in the quarterfinals with the same group _ Sam Querrey, John Isner, twins Bob and Mike Bryan _ that beat Brazil in the first round.
The fourth singles in a Fed Cup series will be scrapped if a team has an unassailable 3-0 lead.
Querrey stepped up after teammate John Isner lost 2-6, 6-4, 6-7 (7), 6-4, 6-3 to Thomaz Bellucci earlier Sunday, forcing a deciding fifth match. It was the first time since 2000 that a U.S. team needed to win the fifth match to advance.
Serbia lost both reverse singles matches to Belgium on Sunday after it qualified for the Davis Cup quarterfinals a day earlier.
It was only the third time the Bryan brothers had dropped a Davis Cup match. It was just the second time that they had dropped a five-set match in ATP competition. Their only other five-set defeat was in a 1999 match at Wimbledon.
The Davis Cup champion Czech Republic begins defending its title on Friday when Lukas Rosol opens against Stanislas Wawrinka of Switzerland.
John Isner is set to return from a knee injury and will play the No. 1 singles spot for the U.S. team against Brazil in the first round of Davis Cup World Group matches.
Australian Open champion Novak Djokovic of Serbia will face 127th-ranked Olivier Rochus of Belgium on Friday in the first round of the Davis Cup.
Isner has not played competitively since withdrawing from his opening-round match at the APIA International Sydney three weeks ago with a knee injury.
Roger Federer might play in the Davis Cup again, although the 17-time Grand Slam champion won't represent his country before the U.S. Open in September.
After beating Andy Murray to become the only man to win three consecutive Australian Open titles, the No. 1-ranked player didn't feel the need to celebrate immediately. Instead, he booked an early Monday flight home to start preparing for his next challenge: the clay courts of Europe.
In years past, Novak Djokovic marked his victories at the Australian Open with rowdy late-night celebrations and bleary-eyed photo shoots the next morning in downtown Melbourne.
