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Kei Nishikori, of Japan, follows through on a shot to Pablo Andujar, of Spain, during the second round of the 2014 U.S. Open tennis tournament, Thursday, Aug. 28, 2014, in New York. (AP Photo/Matt Rourke)

NEW YORK (AP) — Tenth-seeded Kei Nishikori of Japan advanced to the third round of the U.S. Open on Thursday when Pablo Andujar retired with an injury.

Nishikori was leading 6-4, 6-1 when the 48th-ranked Andujar suddenly came to the net. Tournament officials did not immediately detail the nature of the Spaniard's injury.

"It's unfortunate for Pablo today, but I have been playing well ... had good two sets," Nishikori said.

The 24-year-old Nishikori, who has never made it past the fourth round in five previous U.S. Open appearances, has been battling an injury of his own in recent weeks. A severely infected right big toe forced him to miss tuneup events leading up to Flushing Meadows.

Nishikori next faces the winner of 23rd-seeded Leonardo Mayer and Matthew Ebden.



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