Nishikori to skip Cincinnati after slight hip injury

Aug 14, 2015; Montreal, Quebec, Canada; Kei Nishikori of Japan reacts after winning his match against Rafael Nadal of Spain (not pictured) during the Rogers Cup tennis tournament at Uniprix Stadium. Eric Bolte-USA TODAY Sports

(Reuters) - Japan's Kei Nishikori has pulled out of next week's ATP 250 tournament in Cincinnati to rest a minor hip injury ahead of the U.S. Open.

The world number four, who reached the final at Flushing Meadows last year, looked out of sorts in collapsing to a one-sided 6-3 6-0 semi-final loss to Briton Andy Murray in Montreal on Saturday.