ATP, 11 majors between 2001 and 2003
2003 Wimbledon Roger Federer
2003 French Open Juan Carlos Ferrero
2003 Australian Open Andre Agassi
2002 U.S. Open Pete Sampras
2002 Wimbledon Lleyton Hewitt
2002 French Open Albert Costa
2002 Australian Open Thomas Johannson
2001 U.S. Open Lleyton Hewitt
2001 Wimbledon Goran Ivanisevic
2001 French Open Gustavo Kuerten
Only Lleyton Hewitt's name appears twice. 2011 and 2012, you can pretty much pencil in the top 8 before the start of the tournament and get 2/3 correct.
WTA, 7 majors between 2011 and 2012
2012 Wimbledon Serena Williams
2012 French Open Maria Sharapova
2012 Australian Open Victoria Azarenka
2011 U.S. Open Samantha Stosur
2011 Wimbledon Petra Kvitova
2011 French Open Li Na
2011 Australian Open Kim Clijsters
No repeat winners. Between 2001-2003 you could pretty much pencil in the top 8 and be correct 80% of the time.