Question:  The 2011 WPA World Nine-ball Championship was organized by a sport event promotions company based in which city ?
Sentence (from "2011 WPA World Nine-ball Championship"): The 2011 WPA World Nine-ball Championship (a.k.a. the World Pool Championship 2011) was the professional nine-ball pocket billiards (pool) championship, sanctioned by the World Pool-Billiard Association (WPA) and organised by Matchroom Sport.
Relevant evidence: Yes