19. Emma Raducanu vs. Leylah Fernandez (2021)
The 2021 U.S. Open was one of the most exciting in history. It saw the first all-teen match-up since 1999 as Raducanu faced Fernandez for the title. In the end, the British athlete claimed victory after an entertaining game. This was a momentous occasion that saw Raducanu break a stream of records. She became the first qualifier ever to win reach and win a Grand Slam final.

Meanwhile, she became the first British woman to win a Grand Slam since 1977. This instantly made her a hero in her home country. Raducanu was also the youngest woman to win a major since Maria Sharapova in 2004. Immediately, fans projected a great future for the teenage star. She went from relative obscurity to global fame in an instant but it was well-earned (via Republic World).