DOHA: Venus Williams rallied to win the WTA Championships for the first time, defeating Vera Zvonareva 6-7 (5), 6-0, 6-2 at the season-ending event.The Wimbledon champion took command in the last two sets with powerful serving, smashes and aggressive groundstrokes against her Russian opponent.Williams'' ranking will improve to No. 6 from No. 8, while the ninth-ranked Zvonareva also will move up two spots. The two were the lowest-ranked players at the event, which featured the top eight players in the world.