Lorenzo Parra of Venezuela beat South Korea's Choi Yo-sam on a unanimous decision to retain his WBA flyweight title in Seoul.
Parra dominated most of the 12 rounds. Choi fought back with counter-punches but lost speed and took a flurry of head shots during the last round.
The win improved the 25-year-old's record 24-0-0 with 17 knockouts.
The 31-year-old Choi, a former WBC light flyweight champion, dropped to 26-5, including 15 KOs.