With Nalbo in his 70% or less wins Nalbandian without a doubt, more in Australia that it's a good surfacr for him
In this case, I don't know. While Nalbandian showed a lot of guts and great quality in terms ofsome hits against Tipsarevic, he wasn't running because of his knee. Not even at the beggining and then it went worst except in some balls (two or three) and you could see that he was in pain and trying to not show it too much to not give advantage.
The last "real" important match of them was in Wimbledon. The past month, before the exhibition, David was on a party the afternoon before. So, don't count that.
I didn't see Lapenti's match, so I can't have an opinion.
I'd say David, but I don't have too much hope about it. Only if he can dominate the match since the beggining without moving. If not, I think his injury will put him out of AO.
But with Nalbo you never know, this guy is Highlander when he wants to. And this is a GS.