Taishin Isotani, a grandson of former world super welterweight champion Koichi Wajima, stopped Kenji Sato of REBOOT.IBA Boxing Gym in the first round in the semifinal of the welterweight division of the East-Japan rookies’ tournament on Sept. 26 at Tokyo’s Korakuen Hall.

The 21-year-old Isotani will face the winner of the other semifinal match between Kota Matsuno of Kanagawa Atsumi Boxing Gym and Ryoma Yamamoto of DANGAN AOKI BOXING GYM in the Nov. 3 final. Both Matsuno and Yamamoto are former amateur titlists and will be pitted against each other on Sept. 27.

In the day’s fight, Isotani decked his opponent twice with his hard rights, prompting the referee to declare Isotani’s technical knockout victory 1 minute and 36 seconds into the fight.

With the win, Isotani extended his unbeaten streak to four, including three opening-round KOs. Isotani made a debut from Wajima Koichi Sports Gym in May last year.