They have no answer for that.
HERE COMES THE ANSWER-
why nadal not changed game to beat davydenko on HC ?
don't forget rafa is 5 years younger than fed
at end of 07 h2h was 8-6 after 07 fed was declined
that explains how he can't beat him at rg
if 5 year younger guy will come and starts beat nadal
can nadal survive ? no chance
even 1 year younger Murray nole will beat him consistently
at slams though they are not talented as fed
this is difference of generations
next generation player can beat older generation players
easily though they are less talented as they are young
same as fed beat agassi
this is not the case that fed don't give rafa trouble
he has won 10 matches against him shows that
he can beat rafa
he also beat rafa twice on clay also.
remember rafa lost 7 consecutive finals to nole
in 11-12 though he is not better than fed at peak
he is not player with new generation but in rafas generation
if 5 year younger guy will come even less talented
can rafa win 10 matches against him?