
Super Flyweight · Retired · South Korea
In Joo Cho
16-0-0Professional record
At a glance
- Born
- April 13, 1969 (age 57)
- Nationality
- South Korea
- Birthplace
- Muan, South Korea
- Division
- Super Flyweight
- Height
- 5ft 7in (171 cm)
- Stance
- Orthodox
- Pro debut
- April 18, 1992
- Retired
- May 20, 2001
Story
Boxing Only · Updated Jul 8, 2026
Born on April 13, 1969, in Muan, South Korea, In Joo Cho became one of his country’s most accomplished boxers in the super-flyweight division during the 1990s and early 2000s. Fighting out of an orthodox stance, Cho stood at 5 feet 7 inches and built a reputation for his technical ability and disciplined approach in the ring. His professional journey began on April 18, 1992, at the Munhwa Gymnasium in Seoul, where he stopped Rodrigo Boy Louperez with a fourth-round knockout. This victory marked the start of an impressive career that would see him rise to the pinnacle of the 115-pound weight class.
Cho’s amateur career is less documented than his professional exploits, but reports suggest a strong foundation, likely contributing to his rapid rise in the pro ranks. By his 13th professional fight, Cho was in a WBC World Super-Flyweight title bout against the experienced Filipino Gerry Peñalosa on August 29, 1998. In front of a partisan crowd at the Ritz-Carlton Hotel in Seoul, Cho edged out Peñalosa by a split decision, capturing the prestigious belt and solidifying his status as a world champion. The victory demonstrated Cho’s ability to handle pressure against a world-class opponent, a skill that defined much of his career.
During his reign as champion, Cho defended his title five times, showcasing consistency and adaptability. He faced tough competition, including Joel Luna Zarate, whom he defeated via a majority decision, and Keiji Yamaguchi, who outpointed decisively. A rematch with Gerry Peñalosa in January 2000 again tested Cho’s mettle. In another razor-close contest, Cho emerged victorious via split decision, reaffirming his dominance in the division. His other defences included a stoppage victory over Pone Saengmorakot and a unanimous decision against Julio Cesar Avila.
However, Cho’s reign ended on August 27, 2000, in Osaka, Japan, when he faced Masamori Tokuyama. In a high-stakes bout, Tokuyama’s slick counterpunching and movement proved too much, and Cho lost the title by unanimous decision. A rematch on May 20, 2001, at the Sheraton Walker Hill Hotel in Seoul would mark the end of Cho’s career. In a shocking conclusion, Tokuyama stopped Cho in the fifth round, handing the former champion his only knockout loss. Following this defeat, Cho retired with a professional record of 18 wins, 2 losses, and 7 victories by knockout.
Fights
| Result | Opponent | How | Date | Link |
|---|---|---|---|---|
| - | Gerry PenalosaWBC World Super Flyweight Title · Sheraton Walker Hill Hotel, Seoul | Jan 2, 2000 | Fight page |
Fights listed on Boxing Only. For a complete record see the BoxRec link below.