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U.S. Open Day 1

Updated 1238 GMT (2038 HKT) September 1, 2015
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It was a straightforward start for Serena Williams at the U.S. Open. The world No. 1 was up 6-0 2-0 when her first round opponent Vitalia Diatchenko was forced to retire hurt. Williams is bidding to complete the "calendar slam" by winning all four grand slam titles in one year. Clive Brunskill/Getty Images North America/Getty Images
The 2015 U.S. Open began with a huge upset, as last year's men's finalist Kei Nishikori lost to Benoit Paire in five sets in New York. Streeter Lecka/Getty Images North America/Getty Images
Paire, ranked 41st, saved two match points in a fourth-set tiebreak. Afterward, he made new fans and signed autographs. Streeter Lecka/Getty Images North America/Getty Images
A dejected Nishikori entered this year's U.S. Open at No. 4, his highest ever ranking. Streeter Lecka/Getty Images North America/Getty Images
Defending champion Serena Williams needed just 30 minutes to see off Russia's Vitalia Diatchenko in the first round. Clive Brunskill/Getty Images North America/Getty Images
Ana Ivanovic, the former French Open champion seeded seventh, joined Nishikori on the sidelines. Clive Brunskill/Getty Images North America/Getty Images
She was ousted by 2014 Australian Open finalist Dominika Cibulkova in three sets. Clive Brunskill/Getty Images North America/Getty Images
Men's No. 1 Novak Djokovic needed only 71 minutes to beat Brazil's Joao Souza. Michael Heiman/Getty Images North America/Getty Images
Djokovic is bidding to become the second man in the last 45 years -- after Roger Federer -- to play in all four major finals in one season. Michael Heiman/Getty Images North America/Getty Images
The man who beat Nishikori in last year's final, Marin Cilic, progressed in straight sets over Argentine qualifier Guido Pella. Streeter Lecka/Getty Images North America/Getty Images
Venus Williams was embroiled in a slugfest, blowing match points in a second set before seeing off Monica Puig in three. Clive Brunskill/Getty Images North America/Getty Images
Mardy Fish, a former top-10 player, was another winner. Fish, afflicted by a heart ailment and anxiety in recent years, is playing in his final tournament. Streeter Lecka/Getty Images North America/Getty Images