So unfortunate some of the responses in this thread disparaging Ferrer. Like some wise posters, I tend to avoid the General Pro Player section because the level of discourse is so low. The trolling is ridiculous and I'm not writing with those people in mind but perhaps to some of the posters who are new to tennis or have never seen professional tennis in person or don't play much themselves.
Ferrer is hailed by his colleagues for his work ethic and intensity/level of effort on court. There was a quote from Federer in the Montreal Gazette today, "...I feel like probably he [Ferrer] probably works harder than I do, so he probably deserves it more." Do five minutes of reading and you can see how well respected he is on tour. Regardless, Ferrer's record on tour (710–347), his prize money (7th of all time), his longevity, and his titles (27) speak to his work ethic and determination. You don't accomplish what he has on tour if you're not mentally strong. Ferrer is a 5'8" grinder, not a 6'2" all-courter with all the strokes like Federer. He's not going to out-grind Federer; it has nothing to do with "mental toughness" and everything to do with Federer's strokes and athleticism (Federer has a better forehand, backhand, serve, volley and overhead).
Anyways, I encourage posters to post some praise for Ferrer in this thread: the guy's a testament to the game.