The Americans are back in full force at the 2017 U.S. Open.

Venus Williams, Madison Keys, Sloane Stephens, and CoCo Vandeweghe advanced to the semifinals, making it the first time in 36 years all four final female competitors are from the United States.

Even with the biggest superstar in tennis, fellow American Serena Williams out of the tournament (she just gave birth to a baby girl), the U.S. athletes dominated. Venus Williams will be battling Stephens in one semi match, while Vandeweghe will take on Keys in the other matchup.

Here’s a look at the four talented stars in action.