Japan's Kei Nishikori defeated Russia's Karen Khachanov on Thursday to book a spot in the quarterfinals of the Erste Bank Open.World No. 11 Nishikori beat No. 19 Khachanov 6-2, 6-2 in the second round of the ATP 500 tournament at Vienna's Stadthalle. The Japanese fifth seed will face the winner of a match between top-seeded Dominic Thiem of Austria and Sam Querrey of the United States.Nishikori, who had lost two of their three previous meetings, broke Khachanov's serve twice in each set to wrap up the match in just over an hour."I'm a little surprised at this score. Everything about the mat…READ FULL ARTICLE
