NEW YORK (AP) — Serena Williams tied Martina Navratilova’s professional-era women’s record with her 306th career victory in a Grand Slam match, beating Vania King 6-3, 6-3 to reach the U.S. Open’s third round.

Hitting 13 aces Thursday night with the roof closed at Arthur Ashe Stadium, Williams improved to 306-42 in matches at major tournaments, a winning percentage of .879.

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Music power couple Beyonce and Jay Z sat behind Williams’ coach Patrick Mouratoglou in the player’s guest box.

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Only Roger Federer, with 307, has won more Grand Slam matches than Williams in the Open era, which dates to 1968.

Williams can match Federer’s total by beating 47th-ranked Johanna Larsson of Sweden on Saturday.

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