Wow, great question. If you consider Fed, Sampras, Everet, Conners, Austin, Edberg, Henin, Courier, Williams sisters, Davenport as part of your Wilson profile, that is a ton. Yonex picks up with the Martina's, Seles, Hewitt, and Ivanovic which isn't a bad haul. Then the Dunlop rackets with Mac and Graf and Johannson. Head has Agassi, Safin. Prince has Sharapova, Ferrero, Capriati and Chang. Babolat has Roddick, Clisters, Rafa, and Moya. Now, those are the obvious recent players and sticks. But from just initial quick count I would say Wilson.
Wilson has 15 or 16 from federer alone. plus another 14 from pete, one from Courier. so thats 30 - wilson has thirty. so for the last 20 years I have been playing tennis wilson was winning 2 or more. plus the william sisters Gee this will be hard.