Brock Lesnar is returning to the UFC Octagon.

UFC officials announced that the professional wrestling superstar and former UFC heavyweight champion will face an undisclosed opponent at UFC 200 on July 9. The news comes despite an announcement by Lesnar in March 2015 that he was "closing the door on MMA."

Brock Lesnar hasn't competed in the UFC since 2011, but that will change July 9. Josh Hedges/Zuffa LLC/Getty Images

The WWE said Saturday night that Lesnar was "granted a one-off opportunity" to return to the UFC for the July fight and that he'd return for WWE's SummerSlam on Aug. 21.

Lesnar Returns To The Octagon Brock Lesnar won the heavyweight belt at UFC 91 against Randy Couture (Nov. 15,2008), defended it twice, then lost it at UFC 121 against Cain Velasquez (Oct. 23, 2010). Lesnar is one of five heavyweights in UFC history to defend the heavyweight belt twice. No one has done it more than twice. UFC heavyweight champions with two consecutive title defenses Randy Couture 2001 Andrei Arlovski 2005 Tim Sylvia 2006 Brock Lesnar 2010-11 Cain Velasquez 2013 -- ESPN Stats & Information

Lesnar, who turns 39 next month, is a former NCAA Division I wrestling champion. He made a successful transition from professional wrestling to mixed martial arts in 2007. The UFC signed Lesnar despite a 1-0 professional record. He debuted against former champion Frank Mir and lost via submission.

Lesnar went on to win his next four bouts, including a November 2008 UFC title fight against Randy Couture. Lesnar avenged the Mir loss at a landmark UFC 100 event on July 11, 2009, in Las Vegas. After that bout, Lesnar was sidelined for a year because of diverticulitis, an intestinal disorder.

He went on to compete two more times, suffering knockout losses to Cain Velasquez and Alistair Overeem, the latter in December 2011. Lesnar trained for a comeback last year and was in negotiations with the UFC on a new deal, but ultimately decided to re-sign with WWE.