- Bats Right, Throws Right
- Height 5' 11", Weight 180 lb.
- High School Osaka Toin High School
Sidearmer Yoshihiro Seo was 4-4 with a 2.37 ERA for the 1993 Thunder Bay Whiskey Jacks. He was third in the Northern League in ERA in its first season. On June 30, he faced 70-year-old Minnie Minoso, coming up for a stunt. Seo got Minoso on a grounder back to the mound.
Seo was 1-2 with a 3.67 ERA for the Kintetsu Buffaloes in 1996; his only career win in Nippon Pro Baseball was by shutout. He tossed 6 1/3 shutout innings in 1997 but walked six and would never make it back up. He was traded to the Yomiuri Giants in 1998 and retired after the 2000 season.