Tennis player Serena Williams continued to extend her dominance over the weekend, winning her 23rd Grand Slam with a victory in the Australian Open final over her sister Venus.

The impact of the Williams sisters on the game of tennis has been historic — not only because of their success but also because of their backgrounds, which are quite different from most champion tennis players.

To learn more about diversity in tennis and the Williams sisters, we spoke with journalist Mike Wise of ESPN’s The Undefeated.