Harimoto, the world number four, defeated Germany's world number 12 Dimitrij Ovtcharov in six games at the Lusail Multipurpose Hall in Qatar, winning 8-11, 11-8, 11-8, 11-13, 11-7, 11-7.

The 17-year-old prodigy will meet the world number 42 Filus, who has raised eyebrows on his way to the final.

He shocked Jang Woo-jin of South Korea in the round of 32 and kept the results going in his favour with an 11-9, 9-11, 11-4, 8-11, 11-5, 11-7 victory over Darko Jorgic of Slovenia, the world number 31.

Japan's Mima Ito was pushed to her limit at times during her match with Jeon Ji-hee of South Korea, but the world number two had more than enough to defeat the world number 15, as she was victorious by a score of 11-5, 17-15, 9-11, 11-5, 15-13.

Singapore's Feng Tianwei headed into her semi-final against Romania's Elizabeta Samara as the firm favourite and the world number 12 duly delivered, winning in straight games 11-8, 11-4, 11-3, 11-5 to set up a final with Ito.

Finally, Chinese Taipei's Cheng I-Ching and Lin Yun-Ju will feature in the mixed doubles final after defeating Slovakia's Lubomir Pistej and Barbora Balazova in the final game, winning 11-6, 9-11, 11-9, 11-6, 11-0.

There they will meet South Korea's Jeon Ji-hee and Lee Sang-su after they came from a game down to defeat Jun Mizutani and Mima Ito of Japan 3-11, 11-4, 11-9, 11-9.

Jeon makes the final following her singles defeat to Ito in the women's semi-final.