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Serena Williams, Winning US Open

STAN HONDA/AFP/Getty Images

Serena Williams has done it again!

The current world number one outplayed former world No. 1 Caroline Wozniacki in the U.S. Open final Sunday, beating her pal 6-3, 6-3. The big victory secured Williams' 18th career grand slam singles title, tying with tennis legends Chris Evert and Martina Navratilova. Williams is now just four behind Steffi Graf, who holds the all time record with 22 career grand slam single titles in the open era.

"Thank you everybody for the incredible support these weeks! It was a good run, unfortunately lost to a better player today!" Wozniacki said on Instagram. "Congrats @serenawilliams on #18, well deserved!"

How did it feel to win the U.S. Open?

"It was a really wonderful feeling," Williams told reporters. "It was wonderful finish."

"You are an unbelievable champion and an inspiration on and off the court," Wozniacki, 24, told Williams, 32, after the match ended. "And we'll go for drinks later."

Serena Williams, Instagram

Instagram

And that's exactly what they did! The tennis pros partied with Williams' BFF Val Vogt, plus model Gigi Hadid and Joe Jonas. Wozniacki shared a selfie that featured her and Williams "out and about NYC" before meeting up with their pals.

Williams shared several pictures from their night of partying via her own Instagram account. A newly single Jonas also posted for a picture of himself the tennis pros, writing, "Amazing job ladies congrats!"

Serena Williams, Instagram

Instagram

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