Belgium's Kim Clijsters, a four-time grand slam champion, holds a giant racket as she greets her supporters after winning a ceremonial farewell match against Venus Williams of the US in Antwerp, Belgium, on Wednesday. 

Belgium's Kim Clijsters, a four-time grand slam champion, gestures during a ceremonial farewell match against Venus Williams of the US in Antwerp, Belgium, on Wednesday. 

 Belgium's Kim Clijsters, a four-time grand slam champion, holds a giant racket as she greets her supporters after winning a ceremonial farewell match against Venus Williams of the US in Antwerp, Belgium, on Wednesday.

Belgium's Kim Clijsters, a four-time grand slam champion, gestures during a ceremonial farewell match against Venus Williams of the US in Antwerp, Belgium, on Wednesday. 

Belgium's Kim Clijsters returns a ball during a ceremonial farewell match against Venus Williams of the US in Antwerp, Belgium, on Wednesday. 

 Belgium's Kim Clijsters, a four-time grand slam champion, greets Venus Williams of the US before  a ceremonial farewell match in Antwerp, Belgium, on Wednesday.

Belgium's Kim Clijsters, a four-time grand slam champion, waves to her supporters before a ceremonial farewell match against Venus Williams of the US in Antwerp, Belgium, on Wednesday.