Manny Pacquiao decided he wanted to pursue a career in boxing after Mike Tyson suffered one of the biggest shock losses in the sport’s history. Manny Pacquiao‘s boxing journey began when he was just 12 years old and he started boxing competitively while working as a construction worker years later. Photo by Kaku KURITA/Gamma-Rapho via Getty ImagesMike Tyson’s loss to Buster Douglas changed Pacquiao’s life ‘forever’In 1990, Mike Tyson was regarded as one of the biggest stars in sport and was undefeated at 37-0, reigning as the undisputed heavyweight champion of the world. Douglas knocked Tyson down for the first time in his career after landing a flurry of four punches. In his autobiography that he wrote in 2010, Pacquiao claimed that Tyson’s loss to Douglas ‘changed his life forever’.