Jack Sock takes down Nishikori in the BNP Paribas Open quarterfinals. Read more: http://tennischannel.com/news/more-stories/sock-downs-nishikori-in-indian-wells-quarterfinals

INDIAN WELLS, Calif -- 17th seed Jack Sock stunned 4th seed Kei Nishikori in the quarterfinal match of the BNP Paribas Open, scoring his first Top 5 win.The American faces Roger Federer, who had a walk-over after Nick Kyrgios withdrew earlier today citing