Ronny Markes meets promotional newcomer Cully Butterfield at WSOF 12

Promotional newcomer Cully Butterfield (13-3) has agreed to step in on short notice and face Ronny Markes (14-3) at WSOF 12.

MMAjunkie today learned from WSOF President Ray Sefo that Roufusport fighter Butterfield has agreed to take the matchup, completing the night’s NBCSN-broadcast five-fight main card, which airs at 10 p.m. ET (7 p.m. PT local time).

Featuring a lightweight matchup between top contenders Lewis Gonzalez and Luis Palomino, WSOF 12 takes place Aug. 9 at Las Vegas’ Hard Rock Hotel & Casino. Preliminary-card bouts, which stream on MMAjunkie, are expected to be announced shortly.

Butterfield opened his career in 2009 and went just 3-2 in his first five professional fights. However, “The Mason” has since gone 10-1 in his past 11 outings, with the lone loss coming via decision. Meanwhile, 10 of Butterfield’s 13 career wins have come by stoppage, including seven by knockout and three by submission.

Meanwhile, Markes will make his WSOF debut while also moving from middleweight, where he finished a five-fight UFC run, to light heavyweight, the division where he started his career. The 26-year-old Nova Uniao fighter was 13-1 in his career before electing to move to 185 pounds and going just 2-2.

With the addition to the card, the WSOF 12 lineup now includes:

• Luis Palomino vs. Lewis Gonzalez
• Cully Butterfield vs. Ronny Markes
• Elvis Mutapcic vs. Kelvin Tiller
• Brandon Hempleman vs. Alexis Vila
• Bryson Hansen vs. Matt Sayles

For more on WSOF 12, stay stay tuned to the MMA Rumors section of the site.

(Pictured: Ronny Markes)