This tennis ball has been signed by Roger Federer. It comes in a clear, acrylic cube. 

Considered by many to be the greatest tennis player of all time, Federer has won a record 20 Grand Slam titles - including a record 8 Wimbledon championships - and has held the world number one ranking a record 310 weeks, including 237 consecutive weeks between February 2004 and June 2008. 

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.