So the 2011 final was more like how he used to play clay, when he was a younger player. You might recall that Roger wasn't really a world beating clay court player, until ~2005. Before that point he would play it more like a hardcourt, and he lacked consistency. The change into more of a point constructer as he got older really payed dividends against most of the tour and his clay results improved. As the years went on, he started to grind it out even more, hoping to out Rafa Rafa a bit. That strategy ended up paying dividends as he grinded his way to the 2009 championship, but of course he was really still overmatched when he played Nadal utilizing that style as 2008 and 2010 showed.
In 2011, I think there was a concerted effort by his team to take him away from the point constructer, passive rally player and to go back to his hardcourt and fast court roots and to implement a more aggressive strategy. So more serve and volley, more hitting flat winners etc.
The 2011 match was really the beginning of Roger going back to that speedy style, and coupled with the fast FO that year (the surface was less bouncy and swifter) as well as a slowdown in Nadal's defense and movement and well he managed to make a match out of it.