Japan's Kei Nishikori suffered a straight sets loss Friday against former world No. 1 Novak Djokovic of Serbia and made a semifinal exit at the U.S. Open.Nishikori was handed a swift defeat at Arthur Ashe Stadium, losing 6-3, 6-4, 6-2 to the sixth seed. He took his 14th straight loss against the Serbian, a two-time U.S. Open winner who now boasts a 15-2 record against the Japanese."Today I couldn't play like myself," Nishikori said. "There were moments when I couldn't keep up with (Djokovic's) level and get my feet moving.""These last two weeks I've played good tennis and I think I'm just w…READ FULL ARTICLE