This ball has been signed by tennis great, Billie Jean King. 

Considered one of the greatest tennis players of all time, King won 39 Grand Slam titles (12 in Singles, 16 in Doubles and 11 in Mixed Doubles). Her most famous victory may be "The Battle of the Sexes" in 1973 when she defeated Bobby Riggs in three sets. 

In 1973, King founded the Women's Tennis Association (WTA), the principal organizing body of women's professional tennis.

This ball comes with a multi-colored certificate of authenticity bearing the official Sports Gallery seal. Matching tamper-proof numbered holograms are located on both the certificate of authenticity and the back side of the ball.