Serena Williams won Wimbledon last weekend to tie Steffi Graf for the most Grand Slam titles in the Open era with 22.

But it's no time to take a breather.

Williams and her sister Venus will be headed to the 2016 Rio Olympics with the rest of the U.S. tennis team, as announced Friday by the United States Tennis Association.

This is the fourth Olympics for Serena, who won gold in both singles and doubles (teamed with her sister) at the 2012 London Games.

The Williams sisters have won four gold medals apiece, more than any other tennis players. Venus won singles gold in 2000, and the pair won gold in doubles in 2000, 2008 and 2012. Serena did not participate in the 2004 Olympics due to injury.

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Serena and Venus Williams hope to secure more gold medals in Rio. Getty Images

Jack Sock is the highest ranked men's singles player on the squad, currently sitting at No. 26 in the world.

The Bryan brothers (Bob and Mike), currently ranked third and fourth respectively in doubles, will also be heading to Rio.

Here is the full U.S. Olympic tennis team for the Rio Games:

  • Brian Baker (men's singles)
  • Mike Bryan (men's doubles)
  • Bob Bryan (men's doubles)
  • Steve Johnson (men's singles)
  • Madison Keys (women's singles)
  • Denis Kudla (men's singles)
  • Bethanie Mattek-Sands (women's doubles)
  • Jack Sock (men's singles)
  • Sloane Stephens (women's singles)
  • Coco Vandeweghe (women's doubles)
  • Serena Williams (women's singles, doubles)
  • Venus Williams (women's singles, doubles)