Submission ace Brock Larson completes one-night, eight-man MMA tournament field

BattleGrounds MMA (www.battlegroundsone.com) announced today that it has filled the last remaining spot for O.N.E., its highly-anticipated, one-night, eight-man welterweight (170 pounds) tournament at BOK Center in Tulsa, Okla. on Friday, June 27, with two-time world championship contender and two-time, one-night tournament winner Brock Larson (37-8) of Brainerd, Minn.