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Best of 2015 U.S. Open - Day 1

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Nadal of Spain reacts after winning a point against Coric of Croatia during their match at the U.S. Open Championships tennis tournament in New York
Rafael Nadal of Spain reacts after winning a point against Borna Coric of Croatia during their match at the U.S. Open Championships tennis tournament in New York, August 31, 2015. REUTERS/Carlo Allegri (REUTERS)
Williams of the U.S. serves to Diatchenko of Russia during their match at the U.S. Open Championships tennis tournament in New York
Serena Williams of the U.S. serves to Vitalia Diatchenko of Russia during their match at the U.S. Open Championships tennis tournament in New York, August 31, 2015. REUTERS/Lucas Jackson (REUTERS)
Williams of the U.S. wipes down during her match against Diatchenko of Russia at the U.S. Open Championships tennis tournament in New York
Serena Williams of the U.S. wipes down during her match against Vitalia Diatchenko of Russia at the U.S. Open Championships tennis tournament in New York, August 31, 2015. REUTERS/Lucas Jackson (REUTERS)
Williams of the U.S. walks on the court before her match against Diatchenko of Russia at the U.S. Open Championships tennis tournament in New York,
Serena Williams of the U.S. walks on the court before her match against Vitalia Diatchenko of Russia at the U.S. Open Championships tennis tournament in New York, August 31, 2015. REUTERS/Carlo Allegri (REUTERS)
Williams of the U.S. prepares to serve to Diatchenko of Russia during their match at the U.S. Open Championships tennis tournament in New York
Serena Williams of the U.S. prepares to serve to Vitalia Diatchenko of Russia during their match at the U.S. Open Championships tennis tournament in New York, August 31, 2015. REUTERS/Shannon Stapleton (REUTERS)
Cibulkova of Slovakia returns to Ivanovic of Serbia during their match at the U.S. Open Championships tennis tournament in New York
Dominika Cibulkova of Slovakia returns to Ana Ivanovic of Serbia during their match at the U.S. Open Championships tennis tournament in New York, August 31, 2015. REUTERS/Mike Segar (REUTERS)
Ivanovic of Serbia serves to Cibulkova of Slovakia during their match at the U.S. Open Championships tennis tournament in New York
Ana Ivanovic of Serbia serves to Dominika Cibulkova of Slovakia during their match at the U.S. Open Championships tennis tournament in New York, August 31, 2015. REUTERS/Mike Segar TPX IMAGES OF THE DAY (REUTERS)
Ivanovic of Serbia serves to Cibulkova of Slovakia during their match at the US Open Championships tennis tournament in New York
Ana Ivanovic of Serbia serves to Dominika Cibulkova of Slovakia during their match at the US Open Championships tennis tournament in New York, August 31, 2015. REUTERS/Mike Segar (REUTERS)

NEW YORK (Reuters) - Serena Williams is on the brink of the grandest achievement in tennis, the single season Grand Slam, and even the leading men at the U.S. Open championships starting on Monday are cheering her on.