The two-time Wimbledon champion fought off four match points to defeat the American in a third set tie-break.

Before each day's play at the BNP Paribas Open, we'll preview three must-see matches.

Over the course of 86 minutes, Kvitova won the match in convincing and revealing fashion against the 21-year-old American, whose mother is also a famed player from Czechoslovakia: Hall of Famer Hana Mandlikova.

Two-time Grand Slam champion Victoria Azarenka shared a sweet note from son Leo, while Ana Ivanovic and Taylor Fritz sent the love to their followers.

In the men's event, Thanasi Kokkinakis upset top seed Andrey Rublev in three sets Wednesday.

The American got back to her winning ways at the United Cup—even if in the slightly unfamiliar discipline of mixed doubles.

Great Britain, Switzerland and France also scored wins over Australia, Kazakhstan and Argentina, respectively, to lead their groups.

The two-time Wimbledon champion battled past the No. 3-ranked American at the United Cup in Sydney on Friday.

Once again, after all these years, whatever the Spaniard could do, the Czech could do a little bit better.

Sixteen nations secured entries announced Thursday, with two spots remaining in the mixed team event. The U.S. features four Top 20 players.