Wilson Australian Open Series Tennis Balls 4 pack In 2006, Wilson became the Official Ball of the Australian Open and also the only manufacturer to have Official Ball Status at 2 of the 4 Grand Slam events. This partnership highlights Wilson39s ability to develop premium tennis balls for the specific needs demanded by Grand Slam events. 2 Grand Slams, Davis Cup and over 40 ATP and WTA events. 1 in tennis!
