Chinese star misses swim final

KAZAN, Russia — No sooner had Sun Yang returned to the top of the podium with two victories at the World Swimming Championships than the Chinese star was enveloped in mystery.

Sun failed to show up for the 1,500-meter freestyle final Sunday night, creating chaos in the call room minutes before the race in which he was the two-time defending champion.

The 23-year-old swimmer later said a heart problem caused him to vanish.

Gregorio Paltrinieri of Italy won the event.