Kei Nishikori, of Japan, acknowledges the crowd after defeating Sam Groth, of Australia, 6-4, 6-4, during a quarterfinal match at the Citi Open tennis tournament, Friday Aug. 7, 2015, in Washington. (AP Photo/Luis M. Alvarez)
Luis M. Alvarez
August 07, 2015

WASHINGTON (AP) Kei Nishikori withstood 15 aces and managed to break Sam Groth's big serve twice for a 6-4, 6-4 victory in the Citi Open quarterfinals Friday.

The second-seeded Nishikori, last year's runner-up at the U.S. Open, saved all four break points he faced en route to reaching a tournament's semifinals for the sixth time this season - and first in five appearances at the hard-court event in Washington.

The first Japanese man to reach a Grand Slam final improved to 41-9 in 2015. Only Novak Djokovic and Andy Murray have won more ATP this matches this year, with 48 apiece.

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