Nadal is playing at the end of the season very poorly, his physical form after injury is low, he was very weak physically. I think Nadal will not be much to fight in this game, he needs to recover your strength for next season. Robredo plays in the mid-level tennis at the end of the season, it is not hard to the profile of the game. I think there will be three sets, it is not necessary for both players, but in two sets 21 is too many.