New Wimbledon champ Serena Williams will not be playing for her World Team Tennis squad this season because of a nasty foot injury.

The tennis star was set to join her team, the Washington Kastles, for the World Team Tennis season.

The co-ed professional tennis league features a total of 10 teams who compete against each other in matches that consist of five sets. Each set is a different style of tennis: men’s and women’s singles, men’s and women’s doubles or mixed doubles. And in each set, coaches decide which player on their team will compete.

According to the Associated Press, Williams was scheduled to play against the New York Buzz on Friday and to play four other matches this season against teams from Philadelphia, Kansas City, and New York again.

“I’m very disappointed that I won’t be able to play in the WTT matches this season,” Serena said in a statement. “It is always such a fun experience, and I love interacting with the fans in the cities that I don’t often have the opportunity to play in during the rest of the year.”

Venus Williams will still be playing for the Kastles this season.

Other well-known tennis players who participate in the league: James Blake plays for the Boston Lobsters, Martina Hingis plays for the New York Buzz, Kim Clijsters and tennis legend John McEnroe play for the New York Sportimes, Maria Sharapova plays for the Newport Beach Breakers, Andy Roddick is on Philadelphia Freedoms and Lindsay Davenport and Anna Kournikova play for the St. Louis Aces.

Last season, the Washington Kastles won the season when they defeated the Springfield Lasers.