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John Isner will play top-ranked Novak Djokovic in the first match Friday of the Davis Cup quarterfinal between the United States and Serbia.

Del Potro snapped his own four-match skid against Djokovic, who had beaten the Argentine in eight of 10 career meetings.
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.
Rain postponed most of the singles matches at the Delray Beach International Tennis Championships on Wednesday.

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.

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.

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.

Isner has not played competitively since withdrawing from his opening-round match at the APIA International Sydney three weeks ago with a knee injury.
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.
Sloane Stephens didn't just achieve her best Grand Slam result by reaching the semifinals of the Australian Open _ she's also one up on her good friend Sam Querrey.
John Isner and Sam Querrey will join Bob and Mike Bryan on the U.S. team to play Brazil in the first round of Davis Cup World Group matches from Feb. 1-3.

Novak Djokovic repelled a challenge from Radek Stepanek to advance to the fourth round of the Australian Open and still had plenty left over to unleash some stinging shots at Lance Armstrong after the doping-tainted cyclist's long-expected confession.
Novak Djokovic slammed Lance Armstrong's long-delayed doping admissions, saying the seven-time Tour de France winner is a disgrace to cycling and "should suffer for his lies."
After being sidelined with injuries for nearly six years, Brian Baker was finally back on the court with a second chance at a professional career.

Agnieszka Radwanska extended the best winning streak of the year to 11 matches as she rolled into the third round of the Australian Open with a 6-3, 6-3 win over Romania's Irina-Camelia Begu on Wednesday.
"I was very happy with the way I battled through (the match)," Querrey said. "I fought through the tough points and got breaks in the second, third and fourth sets. I was just happy to get through it."
Querrey said he couldn't recall the last time he served as well.