Osaka won her first Grand Slam at the US Open on September 8, 2018, when she was just 20 years old. She defeated Serena Williams in the final, winning in straight sets with a score of 6-2, 6-4. She went on to win the Australian Open on January 26, 2019, against Petra Kvitová, making her the champion of two Grand Slam tournaments in a row. Let's hope she's popped some Champagne since then.