Re: Is it safe to say now that grass is Nadal's worst surface?
No. Hardcourts are still his worst surface. Rafa's best winning percentage after FO is Wimbledon, and his worst is USO which is not surprising considering the speed and play of the surfaces. Rafa moves quite well on the grass, he was definitely the second best mover for a long time behind Federer on the surface. Yes he struggled quite a bit over the past half decade during the first week (Muller, Kendrick, Soderling, Haase, Petzschner and then Rosol) but notice all of these are big servers which are always a nightmare to play against especially on fresh grass. But even then, he was still winning. His Wimbledon preparation the last two years have been quite poor and his scheduling continues to put unnecessary strain on him which is most evident off clay because of all the defending he has to potentially do on faster surfaces and now it has caught up to him whereas in previous years he was mentally strong enough to get through these types of rounds.
Federer / Haas / Safin / Gaudio / Kuerten / Youzhny / Nadal / Gonzalez / Ljubicic / Hewitt / Soderling / Wawrinka / Coria / Nalbandian / Kohlschreiber