Serena Williams is playing at her final U.S. Open, and she has just entered the court for her very first round!

The tennis player of 40 years took a train ride to make her court debut this Tuesday (August 29) at the USTA Billie Jean King National Tennis Center in New York City.

Serena will play Danka Kovinic from Montenegro in the opening round of the tournament for women's singles.

Nike announced it was Serena wearing the figure skating dress which is decorated with diamonds her NikeCourt Flare 2 tennis sneaker.

This month Serena made it clear that she would quit tennis following her participation in this year's U.S. Open.