The definitive list (thanks for the help @Arti, @Seth & @vsbabolat ):
Mats Wilander: 16x18
Juan Martin Del Potro: 18x20 - 2009 US Open Singles
Marin Cilic: 16x18
Todd Woodbridge: ?
Mark Woodforde: ?
Daniel Nestor: 16x18
2002 Aussie Open Doubles
07/10/11/12 French Open Doubles
2008/2009 Wimbledon Doubles
2004 US Open Doubles
Mahesh Bhupathi: 16x18 - 99/01 French Open -- 1999 Wimbledon -- 2002 Us Open
Jonas...
Pro's (Past and Present) That Have Swung a Wilson 6.1 [Includes major winners]
Mats Wilander: 16x18
Juan Martin Del Potro: 18x20 - 2009 US Open Singles
Marin Cilic: 16x18
Todd Woodbridge: ?
Mark Woodforde: ?
Daniel Nestor: 16x18
2002 Aussie Open Doubles
07/10/11/12 French Open Doubles
2008/2009 Wimbledon Doubles
2004 US Open Doubles
Mahesh Bhupathi: 16x18 - 99/01 French Open -- 1999 Wimbledon -- 2002 Us Open
Jonas...
Pro's (Past and Present) That Have Swung a Wilson 6.1 [Includes major winners]