American Jack Sock and Marcos Baghdatis of Cyprus moved into the second round of the U.S. National Indoor Tennis Championships Tuesday at The Racquet Club of Memphis. Sock, who reached the quarterfinals of last year's tournament, advanced with a 7-5, 1-6, 7-6 (5) victory over France's Adrian Mannarino. Also advancing into the second round Tuesday was No. 8 seed Mikhail Kukushkin and Croatian Ivo Karlovic. Japan's Kei Nishikori, ranked 16th in the world, is the top seed in the tournament and will play his first match Wednesday. More...