Team China has already secured at least one gold medal at the 2018 BWF World Championships here on Saturday, as Wang Yilyu and Huang Dongping beat the pair from the Hong Kong SAR to set up a final against teammates Zheng Siwei and Huang Yaqiong.

The second-seeded duo needed only 30 minutes to cruise past third seeds Tang Chun Man and Tse Ying Suet 21-6, 21-10. In the other semifinal held later, top seeds Zheng and Huang Yaqiong came from one game down to overcome another home pair, Zhang Nan and Li Yinhui, 19-21, 21-12, 21-10.

Zheng and Huang Yaqiong paired up late last year, but have won all their previous four clashes against Wang and Huang Dongping. The recent one was in the final of the Malaysia Open last month, where they defeated their compatriots 21-19, 21-18 to clinch their second title of 2018.

Spaniard Carolina Marin is set to play Pusarla V. Sindhu of India in the showdown of BWF World Championships women's singles event, which will see a rematch of the final at the Rio Olympics two years ago.

Marin, seeded seventh, knocked out sixth seed He Bingjiao 13-21, 21-16, 21-13 in the semifinal stage here on Saturday, while Sindhu dispatched Japanese star Akane Yamaguchi 21-16, 24-22.

"To reach the final here means a lot for me. When I came here, I knew that I was not the favorite to win this. I don't have any kind of pressure when I play here. I just want to do my best from the first game to the final," said two-time title winner Marin, whose career's biggest victory was against Sindhu in the final at Rio 2016 when she defeated the Indian 2-1 to win the first Olympic gold medal for Spain in badminton sport.

It is the second straight final for Sindhu in the BWF World Championships, as she fell to Japan's Nozomi Okuhara 2-1 in an enthralling final last year. 

The men's doubles event will also be a clash between Chinese and Japanese titans. 

Fourth-seeded Li Junhui and Liu Yuchen got the better of another Chinese duo, title holders Liu Cheng and Zhang Nan in straight games to set a final against fifth seeds Takeshi Kamura and Keigo Sonoda.

In the women's doubles actions, Wakana Nagahara and Mayu Matsumoto beat Indonesia's pair Greysia Polii and Apriyani Rahayu 21-12, 23-21 to set the final against Yuki Fukushim and Sayaka Hirota, who eliminated Japanese compatriots Koharu Yonemoto and Shiho Tanaka 21-19, 21-15 in Saturday's other semifinal.