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BAMMA 3: Horwich vs. Watson was a mixed martial arts event held by the British Association of Mixed Martial Arts on May 15, 2010 at the LG Arena in Birmingham, England. It featured three title fights, and was headlined by Matt Horwich and Tom Watson.

Tabloid celebrity and former MMA fighter Alex Reid was scheduled to return to the cage and face Tom Watson at the event. However, Reid injured his knee while filming his documentary TV series Alex Reid: The Fight of His Life and was forced to pull out of the fight. Reid was then replaced by UFC and IFL veteran Matt Horwich.