Kyrgios wins claycourt opener in Houston

Nick Kyrgios has set up a quarter-final with big-serving Croat Ivo Karlovic at the US Claycourt Championships in Houston.

Nick Kyrgios has made a successful start to his 2018 claycourt season with victory in his opening match of the ATP event in Houston.

After enjoying a first-round bye, Australia's fourth seed beat American Bjorn Fratangelo 6-7 (2-7) 6-1 6-2 on Wednesday at the US Claycourt Championships.

Kyrgios will next play veteran Croat Ivo Karlovic in the quarter-finals.