year australian open          french open       wimbledon                us open
0   2003    andre agassi  juan carlos ferrero   roger federer           andy roddick
1   2004   roger federer        gastón gaudio   roger federer          roger federer
2   2005     marat safin         rafael nadal   roger federer          roger federer
3   2006   roger federer         rafael nadal   roger federer          roger federer
4   2007   roger federer         rafael nadal   roger federer          roger federer
5   2008  novak djokovic         rafael nadal    rafael nadal          roger federer
6   2009    rafael nadal        roger federer   roger federer  juan martín del potro
7   2010   roger federer         rafael nadal    rafael nadal           rafael nadal
8   2011  novak djokovic         rafael nadal  novak djokovic         novak djokovic
9   2012  novak djokovic         rafael nadal   roger federer            andy murray
10  2013  novak djokovic         rafael nadal     andy murray           rafael nadal

Table as JSON:
{"year":{"0":2003,"1":2004,"2":2005,"3":2006,"4":2007,"5":2008,"6":2009,"7":2010,"8":2011,"9":2012,"10":2013},"australian open":{"0":"andre agassi","1":"roger federer","2":"marat safin","3":"roger federer","4":"roger federer","5":"novak djokovic","6":"rafael nadal","7":"roger federer","8":"novak djokovic","9":"novak djokovic","10":"novak djokovic"},"french open":{"0":"juan carlos ferrero","1":"gastón gaudio","2":"rafael nadal","3":"rafael nadal","4":"rafael nadal","5":"rafael nadal","6":"roger federer","7":"rafael nadal","8":"rafael nadal","9":"rafael nadal","10":"rafael nadal"},"wimbledon":{"0":"roger federer","1":"roger federer","2":"roger federer","3":"roger federer","4":"roger federer","5":"rafael nadal","6":"roger federer","7":"rafael nadal","8":"novak djokovic","9":"roger federer","10":"andy murray"},"us open":{"0":"andy roddick","1":"roger federer","2":"roger federer","3":"roger federer","4":"roger federer","5":"roger federer","6":"juan martín del potro","7":"rafael nadal","8":"novak djokovic","9":"andy murray","10":"rafael nadal"}}