The China National Swimming Championships came to an end on Thursday.
Following on his success from the FINA World Championships last month, Olympic and world champion Sun Yang has cruised to victory in the 400m freestyle.
"I'm happy with the win. It's actually beyond my expectations. Before the event, I thought I could clock around 3 minutes-45 seconds because I'm not in the best of health after the world championships in Kazan. I really didn't think I'd be able to swim this fast. This is also the world's best performance this year. So I'm very happy."
Sun has taken 3 gold medals and one bronze at this year's national championships.
Yu Hexin of Guangdong took the men's 50m freestyle.
Hunan's Huang Chaosheng to the men's 200m breaststroke.
On the women's side, Zhu Menghui has claimed the title in women's 50m freestyle, beating Liu Xiang of Guangdong and Guo Tingru of Beijing.
"I had hoped that I could swim a personal best performance. But I've been too tired recently, as we didn't take a rest after the world championships in Kazan."
The gold in women's 400m individual medley went to Hunan's Li Xuanxu.
And it was Xu Danlu of Ningxia winning the women's 800m freestyle.
473 swimmers from 27 teams took part in the five-day championships.
