Kei Nishikori of Japan serves against Roko Karanusic of Croatia during their second round match.
Nishikori won the second round contest when Karanusic retired when 6-1, 7-5 down.
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The 18-year-old Japanese, a winner at Delray Beach this year, is playing in his second career Grand Slam.
His maiden appearance at a major event at Wimbledon this year ended in a first round forfeiture.
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