14. Serena Williams vs. Venus Williams (2017)
The Williams sisters changed the face of women’s tennis. They genuinely faced multiple challenges in their early days because of the sport’s culture. However, their mutual brilliance ensured their rise to the top. Venus had a magnificent career but Serena was even better. In 2017, she defeated her sister to claim her 23rd Grand Slam title. This also placed her above Steffi Graff on the all-time list.

The sisters faced off in the final of the Australian Open. Venus lost but she also made history as the oldest athlete to play in a Grand Slam final. She deserves immense respect because she continued playing with an autoimmune disease. It was a beautiful moment for both women because they made so many sacrifices to arrive at this point. Furthermore, Serena called her sister her ‘toughest opponent’ (via PBS).