Table:
text: Federer–Nadal rivalry
Federer–Nadal Grand Slam era
Federer–Nadal Grand Slam era
Year_ Australian_Open French_Open Wimbledon US_Open
2003 Andre Agassi Juan Carlos Ferrero Roger Federer Andy Roddick
2004 Roger Federer Gastón Gaudio Roger Federer Roger Federer
2005 Marat Safin Rafael Nadal Roger Federer Roger Federer
2006 Roger Federer Rafael Nadal Roger Federer Roger Federer
2007 Roger Federer Rafael Nadal Roger Federer Roger Federer
2008 Novak Djokovic Rafael Nadal Rafael Nadal Roger Federer
2009 Rafael Nadal Roger Federer Roger Federer Juan Martín del Potro
2010 Roger Federer Rafael Nadal Rafael Nadal Rafael Nadal
2011 Novak Djokovic Rafael Nadal Novak Djokovic Novak Djokovic
2012 Novak Djokovic Rafael Nadal Roger Federer Andy Murray
2013 Novak Djokovic Rafael Nadal Andy Murray Rafael Nadal

Question: How many years was Andy Murray at Wimbledon in Federer-Nadal rivalry in Grand Slam era in total?

Question: In the Grand Slam era of Federer-Nadal rivalry, what is the 2010 Australian Open?