This Saturday, the UFC celebrates its 25th anniversary by returning the location of its first-ever event; Denver, Colorado.

In the main event, an injury to Frankie Edgar saw Yair Rodríguez (10-2 MMA, 6-1 UFC) step in to face ‘The Korean Zombie’ Chan Sung Jung (14-4 MMA, 4-1 UFC).

Let’s take a look at the recent results of the two men in Saturday night’s main event:

Jung recorded a fourth-round submission win over a 23-year-old Dustin Poirier (ranked third in the UFC’s lightweight division today) in a 2012 Fight of the Year nominee. Jung then faced José Aldo for the UFC featherweight championship, coming up short in a fourth-round TKO loss in August 2013 after dislocating his shoulder mid-fight.

Having spent two years away from MMA action whilst completing military service in South Korea, Jung has only fought twice since May 2012. Injuries have also contributed to Jung’s inactivity, though he was successful in a first-round KO victory over Dennis Bermudez in February of last year.

‘The Korean Zombie’ has been awarded 5 fight night bonuses in 5 UFC fights.

Rodríguez followed a five-round split-decision win over Alex Caceres with an emphatic second-round TKO win over former UFC lightweight and welterweight champion B.J. Penn.

Hype for Rodriguez was at an all-time high after the Penn performance, but a fight last May against another former UFC lightweight champion, Frankie Edgar, proved too soon for Rodríguez. Just 24-years-old at the time of the fight, this time Rodríguez was on the receiving end of a second-round TKO stoppage.