You can clearly see that the base knuckle of the index finger rests on bevel 4 and not on the flat bevel (in the case of full western). In addition his racquet head face, would be alot more closed if he was using full western. Not convinced??? Check out this instructional video in Spanish, where Nadal shows exactly what grip he uses. If you try to pause it from 8.30 onwards, you can clearly see he uses a SW. http://www.youtube.com/watch?v=MZUwZAF9XO4 Credit to the poster, who took a still from the video above. I use the exact same grip, and find I am coming under the ball alot more than expected. Compared to players I hit with, I have an exaggerated windshield wiper motion in my swing. The topspin production is immense.