Nadal was mentally distraught from his parents' divorce and his knees were in bad shape but he still fought for 4 hours to take the victory against a truly inspired Djokovic on Madrid clay in their epic 2009 semifinal match. But 2 years later, Djokovic basically almost routinely crushed a Nadal on the exact same court and who was healthy (no knee problems whatsoever this time) and in good spirits (coming off Monte Carlo Masters win). Nobody can possibly buy that Nadal 2009 was better, physically or mentally, than Nadal 2011. Nadal 2011 won Roland Garros and made Wimbledon final whereas Nadal 2009 lost in the Roland Garros in the 4th round and couldn't even play Wimbledon. So what's the explanation? How did a physically poor version of Nadal in 2009 still beat Djokovic in Madrid but a physically superior version of Nadal in 2011 could not?