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ISTANBUL, Oct 28 (Reuters) - Four candidate cities - Kazan, Russia; Mexico City; Singapore and Tianjin, China - are bidding to host the WTA Championships from 2014 and beyond, the WTA said on Sunday.
The tournament's three-year contract with Istanbul runs out next year.
The winning city will be announced in the spring of 2013. (Reporting by Matt Cronin, Editing by Justin Palmer)