Sakaguchi is a talented martial artist, and most often appears in films featuring copious fight scenes, usually performing all of his own stunts.

He is purportedly skilled in Bajiquan, Shorinji Kempo, Boxing, Kickboxing, and while recently filming Re:Born learned the tactical martial art Zero Range Combat developed by Yoshitaka Inagawa.

He played a larger role in the quirky, yet successful Battlefield Baseball (produced by Kitamura and directed by Yudai Yamaguchi).

He made a cameo appearance in Yoshihiro Nishimura's 2008 exploitation film, Tokyo Gore Police, as well as directed/starred in Yoroi: Samurai Zombie, based on a story by Ryuhei Kitamura.

In 2011, Sakaguchi reprised his role as Yakyû Jubei in Deadball, a reimagining of Battlefield Baseball, and also co-directed/starred in Yakuza Weapon, based on the manga Gokudō Heiki.