I review all match vedio that Nadal lose on youtube.
Murray, Djokovic, Del Potro, Nalbandian, Soldering show us the way how to beat Nadal, consistently attacking every shot and make pressure on Nadal. How to do it?
I think etery point starts from the return and serve. These players has better serve than others. I usually find that Nadal has short return against them. As professional tennis players, they start attacking, make a lot of aggressive shots start from their first contact with these weak returns. In other hand, when Nadal serve it is totally different story. Nadal's serve is weaker, they can make very deep return. They are good returners, especially Murray, Nalbandian and Djokovic. They are able to get short repond from Nadal by their deep return. And every attack start from here. Their game play are good to against Nadal. Nadal's 2010 US open serve has more speed and precise than now. However, it look likes Nadal has techni issue with his serve. His shoulder get injur after US open.
Another reason, why they have success is consistently agressive play increae speed of the groundstroke. Their groundstrokes have average around 120km/h when they against Nadal. Djokovic's average groundstroke speed is improve in Rome Master compare last year, 125km/h vs 116km/h. As Nadal is more like defensive player in style, these players can make Nadal run for every shot and force Nadal to make short respond. Del Potro is the one do it very sucess in 2009 US open. During the groundstroke, I see a lot of short balls from Nadal.
I find another key in Nadal backhand, Nadal's weak backhand. I find that when Nadal is getting back in the grounstroke, Djokovic and other players use both wings to attack Nadal's backhand side. The result is they are able to regain the control of the rally. Djokovic hit a backhand down the line to Nadal's backhand and he get short repond from Nadal, then he makes cross court backhand for winner. Other players have similar combination, like Murray.
It is one of the reasons why Federer has problem with Nadal because Federer only can use his forehand to make pressure like it. His backhand has trouble with Nadal top spin, so he can not do same thing like these players did to Nadal in past 5 years. So Federer use deep and low backhand slice instead of normal backhand shot to protect his backhand and try to regain control groundstroke.
Now we see a similar tactic between Nadal and Djokovic, the difference is instead of forehand, this time is backhand. That is Djokovic's backhand. Nadal use his forehand to push Federer away from baseline. Djokovic use his backhand do the same thing to Nadal. Can Nadal do the same thing against Djokovic like Federer did against he? I don't think so because his backhand slice does not have same variable as Federer. He should find another way, Moonball is not the tatic against Djokovic unless it is very deep and very precise like others have mentioned in this thread.