After shocking Team Canada to advance into the knockout rounds, Elise Mertens and Zizou Bergs will take on another big-name team in the quarterfinals.

On a relatively quiet day, Italy and France also try to get on the board against each other.

From two mixed doubles titles to five Wimbledon titles to winning streaks, weeks at No. 1 and much more, she's already achieved a lot—and she's still going strong.