Alexa Grasso (UFC 285, 2023)
After an up-and-down start to her UFC career, Alexa Grasso moved up to Flyweight and put together an impressive four-fight win streak. However, she was still a sizeable underdog heading into her title fight against champion Valentina Shevchenko. Grasso would send the oddsmakers reeling with a dramatic fourth-round submission victory to claim the belt.