Nadal may not have the coordination or strength with his left arm to execute a 1H in game situation. Yeah, I know, strength of all things -- but the 1 hander uses different kinetic chain in the arm than the forehand. Given that he grew up on a clay game where everybody's shots are heavy, you can see why he prefers the stability of a 2H shot for his non-dominant side.
Weird thing is, you'd think that, but it's really not. When you look at all the guys who grew up learning the game on clay, it's pretty amazing that out of that huge pool of players, of the ones who've actually made it to the tour level, i.e. the best of the best of the clay courters; it's amazing that so many of them have one-handed backhands.
Corretja and Guga and Costa, for all three of them, their one-handed backhands were their best shot, and clearly they were GREAT on clay. Muster's forehand and backhand were pretty equal I thought, and obviously he was great on clay too. Pioline and Arazi were very good on clay, and for Arazi that was in fact his best surface, they both had miraculous one-handers as well, like Corretja, Guga, and Costa; it was their best attribute.
Fernando Melligeni, who was a little thin taurapin twirp of a guy, had an excellent one-handed backhand, and yet he actually STARTED OUT ON TOUR using a two-handed backhan! I mean how crazy is that? And yet the guy ended up making the French Open semis late in his career, and while never quite an elite clay courter, he was always just under that top tier of clay courters.
And basically, the list just goes on and an on with guys like Gaudio and Almagro carrying on the tradition of elite clay courters whose best attribute is their one-handed backhand.
What I've discovered as someone who grew up two-handed, then switched to a one-hander, and can hit both well enough now to hang with very high level players?
I've discovered that on the rare occasion I've hit on clay, I find it MUCH easier to hit my one-handed backhand. I just feel almost ten times more confident in going for my shots and swinging freely. Yeah, the ball bounces higher; but BY FAR more than compensating for that, is that I feel like I have so much more time to get a full swing in.
I mean so many of these great one-handed clay backhands, have these huge, majestic, sweeping swings, and that's why people love to watch them...yet it ends up being much easier for them to get away with that on a clay court.
That's why a guy like Pioline who the rest of his game was basically made for grass/hard/indoors traditional style tennis, his beautiful, elongated, swashbuckling one-handed backhand motion felt so at home on clay. The rest of his strokes were much more compact, with the exception of his backhand. Give him more time on that side, and watch him get into a rhythm with the shot, and it could really be a thing of beauty.