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China's Sun Yang gives thumb up after a men's 400m freestyle heat at the Swimming World Championships in Kazan, Russia, Sunday, Aug. 2, 2015. (AP Photo/Sergei Grits)

Sun Yang leads 400 free heats as swimming starts at worlds

Associated Press KAZAN, Russia (AP) — Competing in his first major event since his doping suspension was revealed, China's Sun Yang led the 400-meter freestyle heats Sunday as the traditional pool events at the swimming world championships opened.