Serena Williams enters the court for her final U.S. match. Open

Serena Williams enters the court for her final U.S. match. Open

Williams will meet Danka Kovinic at Arthur Ashe Stadium in Flushing Meadows, where she won her first U.S. Open in 1999.

Williams announced earlier this month that she was retiring after dominating and changing the game for women and winning 23 Grand Slam singles titles.

Williams received accolades from players and fans as she prepared to play Monday, including a Time magazine cover.

Williams has won six U.S. Open singles titles, the most recent being in 2014.

She has a 20-0 record in U.S. Open first-round matches without dropping a set since 2001.

However, Williams is presently rated 605th in singles and has only recently returned to play after suffering ailments.

Kovinic, who is from Montenegro and is 27 years old, is ranked 80th.

Meadowlark Media's Howard Bryant reported Williams had played four matches and won one.

Williams will remain a trailblazer once she retires. She'll focus on building her 8-year-old venture capital firm.