The biggest surprise of Japan expanded 2025 on the first day took place in the men's single category. The No. 1 seed, the world's No. 1 player Kunlavut Vitidsarn soon left Japan in the opening match. The one who defeated him was Chinese tennis player Weng Hong Yang.

The match between Kunlavut and Weng Hong Yang took place in quite short time. Chinese player overwhelmed 21-13 in set 1. To set 2, the two sides play relatively struggling. However, Weng Hong Yang has been at the end to win 21-19.
Besides Kunlavut, many other strong players soon stopped in Japan to expand early. This is an understandable job, when they are more likely to target China to expand next week. This is the largest Super 1000 prize of the year, with a total bonus of 2 million USD.
On the side of Weng Hong Yang, he will meet Lin Chun Yi in the next match. In the first round, Lin Chun Yi surpassed Weng Hong Yang's teammate Lu Guang Zu. Chou Tien Chen won Jason Teh 6-21, 21-10, 21-12, and Watanabe Koki defeated the overseas Vietnamese Ireland Nhat Nguyen.
In addition to Lin Chun Yi and Chou Tien Chen, another Chinese Taipei player Chi Yu Jen also won the opening match. He passed the representative of host Tanaka Yushi for 41 minutes (September 21, 21-17). They closed a successful competition day of Chinese Taipei players.