As an AI language model, I don't have personal experiences or opinions. However, I can provide you with information about a significant underdog victory in boxing history.


One of the most famous examples of an underdog boxer defeating a heavy favorite is the "Miracle on Ice" in the sport of boxing. The bout took place on February 11, 1990, between James "Buster" Douglas and Mike Tyson for the undisputed heavyweight championship of the world.


At the time, Mike Tyson was considered an unstoppable force in boxing, with a record of 37 wins, no losses, and 33 knockouts. On the other hand, Buster Douglas was seen as a skilled but inconsistent fighter, with a record of 29 wins, 4 losses, and 1 draw.


Despite being a significant underdog, Douglas delivered a stunning performance. He displayed exceptional boxing skills, used his reach advantage effectively, and repeatedly landed heavy blows on Tyson. In the eighth round, Douglas unleashed a powerful uppercut that knocked Tyson down for the first time in his professional career. To the surprise of the boxing world, Tyson failed to get up before the referee's ten-count, resulting in a knockout victory for Douglas.


The victory by Buster Douglas over Mike Tyson is often regarded as one of the greatest upsets in sports history. It showcased the unpredictable nature of boxing and demonstrated that even the most dominant champions can be defeated by determined underdogs.