Horn won a unanimous, albeit highly controversial, points decision at Suncorp Stadium to sensationally claim the WBO welterweight world title.
In the wake of the Australian's triumph, we take a look at previous instances where boxers have unexpectedly overcome the odds.
July 10, 1951: Turpin shocks Sugar Ray
Widely considered one of the finest boxers in history, Sugar Ray Robinson had only been beaten once - by the great Jake LaMotta - in 132 bouts when he defended his world middleweight crown against Randy Turpin at Earls Court Arena.