On This Day Aug. 6, 1966, Muhammad Ali successfully defended the heavyweight championship of the world for the fifth time by scoring a third-round knockout of Englishman Brian London at Earl’s Court Arena in London. Ali, unbeaten in 24 straight fights, was coming off a sixth-round stoppage of the most popular fighter in Britain at the time, Henry Cooper. That bout was eagerly anticipated because Cooper had decked Ali (then known as Cassius Clay) three years earlier in a non-title bout before bei