One-night MMA tournaments are back.

BattleGrounds MMA’s third edition will take place at the BOK Center in Tulsa, Okla. on June 27, and will feature a one-night, eight-man welterweight tournament, and four of those competitors are UFC veterans.

BattleGrounds MMA CEO Kenny Monday informed MMAFighting.com on Wednesday that Dennis Hallman (53-14-2, 1 no-contest), Cody McKenzie (15-4), Josh Bryant (14-4) and Luigi Fioravanti (24-11), who competed inside the Octagon in the past, will be part of the GP. Chris Honeycutt (4-0) is also in, and the final three fighters will be announced "soon."

"We are excited to have assembled a group of incredibly talented and accomplished athletes for this landmark tournament," Monday stated in a release sent to MMAFighting.com.

"The one-night tournament is truly the toughest test physically and mentally in all of combative sports, and BattleGrounds MMA is proud to bring this format back to life and usher in a new era of elite competition in the world’s fastest growing sport."

The winner of the welterweight tournament will be awarded a prize of $50,000. Tickets for the event are on sale at www.bokcenter.com.