Michael Aswell Jr. vs JooSang Yoo booked for UFC 331 on Sept. 19

The UFC has officially confirmed a matchup between Michael Aswell Jr. and JooSang Yoo, set to take place at UFC 331 on September 19.

Aswell Jr., known as "The Texas Kid," enters the bout with an 11-5 record at just 25 years old. The American fighter out of 4oz. Fight Club stands five-foot-eight with a 69-inch reach and fights out of the orthodox stance. He is one of the more active offensive strikers on the roster, landing 7.6 significant strikes per minute, though his accuracy sits at 42 percent. His grappling output is minimal, averaging just 0.24 takedowns per 15 minutes with no recorded submission attempts.

Yoo, nicknamed "Zombie Jr.," brings a nearly unblemished 9-1 record to the fight. The 32-year-old South Korean trains out of Tiger Gym and owns a slight physical edge, measuring five-foot-seven with a notably long 71-inch reach despite his height. Fighting orthodox, Yoo lands 6.36 significant strikes per minute at a striking accuracy of 58 percent, suggesting a more precise and economical approach on the feet. Like Aswell Jr., he has no recorded takedown or submission activity.

Why it matters

• Aswell Jr.'s high output meets Yoo's high accuracy, setting up a striking contrast in styles
• At 25, Aswell Jr. represents an ascending prospect; Yoo's near-perfect record makes him a credible measuring stick
• A win for either fighter could push them firmly into divisional relevance heading into 2027