Serena Williams Beats Sister Venus at US Open: She’s the toughest player I’ve ever played.

Serena is 16-11 in their matches, including 9-5 in majors and 3-2 at the U.S. Open.

Venus Williams, Serena Williams

Serena has the potential to become the first player since Steffi Graf in 1988 to collect all four Grand Slam titles in a calendar year. And if she wins, that would be her fourth U.S. Open in a row, and seventh overall — she would equal Graf with 22 major championships, the most in the professional era and second-most ever behind Margaret Court’s 24.

A photo posted by @usopen on Sep 8, 2015 at 6:46pm PDT

A few celebrities were spotted in the stands at Arthur Ashe Stadium, taking in the match including: Gladys Knight, Oprah Winfrey, Donald Trump, Kendall Jenner and Kim Kardashian, who is close friends with Serena. On Thursday, Serena will play unseeded Robert Vinci of Italy. [Associated Press, Instagram]

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