Yukiko Inui and Kanami Nakamaki won the women's duet free routine in synchronized swimming at the Asian swimming championships on Sunday.

Inui, who won the bronze medals both in duet and team events at the Rio Games this summer, and her new free-routine partner Nakamaki scored 93.2667 points to place above compatriots Minami Kono and Yuriko Osawa (89.6000) and China's Feng Yu and Li Mo (87.8000) at Tatsumi International Swimming Center.

"It was their best performance and that even includes what they've done in training," said head coach Masayo Imura, who has been partnering Inui with Mai Nakamura for the technical routine, with the pair winning that title here on Friday.

"I'd like to look at the video replays and take time to decide (on Inui's regular partner)," Imura said.

Japan won the women's 4x100-meter medley relay after the team of Emi Moronuki, Misaki Sekiguchi, Rikako Ikee and Tomomi Aoki clocked 3 minutes, 57.97 seconds.

Japan suffered its first defeat in women's water polo, losing 10-7 to China to finish the tournament as runners-up with a 5-1 record, but the men secured the title after overcoming Kazakhstan 7-6 in the final.