"I felt better today than yesterday, as I was more or less nervous in my first appearance at the World Championships," she said.

"It was our first partnership at the worlds this time, and we did feel a little nervous," Si pointed out. She gave a score of 9.5 out of 10 for their combination, meaning that the duo still had space for improvement.

"The contention didn't go as easy as imagined. If we had made a mistake, we would have lost the title," added Si.

Kim Mi Rae and Kim Kuk Hyang of DPR Korea were placed second at 336.48. The Malaysian duo of Pamg Pandelela and Cheong Jun Hoong finished third at 328.74.

In their first World Championships after making a comeback, the Chinese sister act of Jiang Wenwen and Jiang Tingting got a silver medal in women's Duet Technical of Synchronized Swimming.

The title went to Russia's Svetlana Kolesnichenko and Alexandra Patskevich. Anna Voloshyna and Yelyzaveta Yakhno of Ukraine were placed third.

France added another gold medal to their strong performance in Open Water Swimming of the tournament as Aurelie Muller triumphed in women's 10km.

The Chinese women's water polo team beat their Brazilian counterparts 11-4 in the Group A opening round.

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