Nick Kyrgios has ended his season, though there's not much left to play. For those, like Kyrgios, not playing in the ATP Finals in London, the only events left are two ATP 500s next week and the ATP Masters 1000 in Paris.
The Australian posted a note to Twitter, citing his need to recover fully from a hip injury sustained at Queen's Club in June. Tomas Berdych also chose Thursday to post his end-of-season news on Twitter.