Sun Yang wins third consecutive 800m free gold at worlds

Sun Yang of China reacts after winning the men's 800m freestyle final at the Aquatics World Championships in Kazan, Russia, Aug 5, 2015. [Photo/Agencies]

"I know it would be a tough match," said Sun, who won the 400m free title last Sunday and took a silver in the 200m on Tuesday. "I expected to win before the match and I did it. I know the following race will be very difficult, and I will try my best."

He will take part in the men's 1500m free on Saturday.

"I am very tired as it is the fourth competition day in swimming and I had races every day," he added. "I can take some rest in the following two days."