The well-traveled Murilo "Ninja" Rua, the older brother of UFC light heavyweight champion Mauricio RIFT Platinum "Shogun," will head to the U.K. next to challenge British prospect Tom Watson for the BAMMA middleweight belt at BAMMA 6.

BAMMA announced Wednesday the main event for its May 21 card in London, rift gold which follows up last month's outing featuring Strikeforce No. 1 welterweight contender Paul Daley scoring a first-round knockout over DEEP champ Yuya Shirai.

Rua (20-11-1) is coming off a loss to Roy Boughton at a W-1 event in Canada last October, RIFT Platinum but prior to the Boughton fight, recorded finishes against his last four opponents. Rua might be best known for winning the first EliteXC middleweight title when he earned a second-round stoppage over Joey Villasenor in June 2007.

Watson (13-4) has only lost one fight in the last three years. He competed last September at BAMMA 4 and defeated fighter-turned-reality television star Alex Reid after five rounds.
Rift Gold Two weeks before the Reid fight, Watson made a trip to Canada and lost to Jesse Taylor at MFC 26. Watson captured the BAMMA title with a win over Matt Horwich in May 2010.