I have to disagree his backhand was always very solid and dangerous. I think his forehand improved immensely and his net game has improved.Nalbandian .
notable improvements - serve, backhand and mental toughness
notable improvements - volleying, forehand
notable improvement - forehand and grinding game.
imrpovements - backhand and volleying.
I totally forgot Ivo, he can actually now rally from the back court, for a few games he was actually hanging in with Roger (not at his best) nevertheless, his ground game improved tremendously. A couple of years ago well 2 or so ago he wouldn't be able to last in rallys longer than 8 strokes, and even then that was stretching it.Canas and Andreev were coming back from long breaks.