Lucas Browne (born 14 April 1979) is an Australian professional boxer and former mixed martial artist and kickboxer. In boxing, he held the Australian and Commonwealth heavyweight titles between 2012 and 2015, and made history by becoming Australia's first world heavyweight boxing champion after winning the WBA (Regular) title in 2016. Browne was stripped of the title two months later for failing a drug test. This ruling was then overturned in September 2016, clearing him of any wrongdoing. In November, Browne produced another positive drug test which he says was due to him buying (legally) a pre-workout supplement without taking the time to properly vet it for compatibility with the WBA's anti-doping regulations.Browne is known for his formidable punching power, possessing a 87.6% knockout-to-win ratio.