Kei Nishikori is into the quarterfinals of his return to the U.S. Open.
The 2014 runner-up in Flushing Meadows beat Philipp Kohlschreiber 6-3, 6-2, 7-5 to reach the final eight in his second straight Grand Slam tournament.
Nishikori missed the U.S. Open last year because of a right wrist injury. The No. 21 seed from Japan returned to the tour early this year, building his confidence back with a victory in a Challenger Tour event, then reached the final in Monte Carlo and the quarterfinals at Wimbledon, where he lost to eventual champion Novak Djokovic.
He will next face either No. 7 seed Marin Cilic — who beat him in the 2014 final — or 10th-seeded David Goffin.
Kohlschreiber was denied again in his fifth attempt to win a fourth-round match at the U.S. Open. The German reached his lone Grand Slam quarterfinal at Wimbledon in 2012.