I also think it is possible... I doubt it will happen this year, but I think Murray will have most hard court points at the end of the season. Clay will be big difference though as Nadal is likely to sweep everything once again. Grass will be interesting but at this point I give Nadal edge over anyone else on grass. I think the main point of that guy is that Nadal will not be confident and comfortable playing Murray on anything other than clay. Murray beat him last 2 out of 3 on hard (plus exo in which both played like it mattered). The Indian Wells final, to me was so one sided only because of the wind, which clearly favored the guy with most topspin in tennis.