I personally handed the ball to Anna Ivanovic where she singed with permanent marker and handed back to me, I certify this signature is authentic. This is your chance to own a tennis ball signed by the number 6 ranked women’s tennis player, Anna Ivanovic! The ball was signed at a tennis tournament final at the Home Depot Center in Los Angeles, California, where she won against Nadia Petrova on August 12, 2007 for the East West Bank Classic, please refer to our pictures of the event. Ivanovic’s signature was signed by her in black permanent marker. Perfect for an tennis fan!