How important is it for Nadal to defend a non-clay title given that Fed has only once defended a clay title (Hamburg 2004-2005). He achieved this at 2005 Hamburg with Nadal absent, beating one top-ten player (#8 Coria) who had just come off an extremely draining tournament losing the final in Rome to Nadal, and beating a qualifier (#56 Gasquet) in the final.
Keep in mind Nadal won Wimbledon in 2 straight appearances in 2008 and 2010, probably as close as you can get to defending without actually defending (some may even consider it defending). Also, he has made it to the final 3 times at non-clay tournaments he was defending losing to Djokovic 2.0 twice and Murray once.
Is this seemingly small circumstance important in comparing the 2?
Keep in mind Nadal won Wimbledon in 2 straight appearances in 2008 and 2010, probably as close as you can get to defending without actually defending (some may even consider it defending). Also, he has made it to the final 3 times at non-clay tournaments he was defending losing to Djokovic 2.0 twice and Murray once.
Is this seemingly small circumstance important in comparing the 2?