What's wrong with Hewitt ?
This is from Hewitt's Wikipedia page:
In a five set match with James Blake at the 2001 US Open, Hewitt complained to umpire Andreas Egli and asked for a black linesman to be moved after being called for two foot-faults in the third set. Hewitt approached the chair umpire and, pointing first to the offending linesman and then to Blake, said, "Look at him [the linesman] and you tell me what the similarity is." Some witnesses, including Blake, had suggested that the "similarity" referred to the colour shared by Blake and the linesman. Hewitt claimed he had merely pointed out that the same linesman had foot-faulted him on both occasions, while other officials had made no such calls.
During the 2001 French Open he was fined US$1000 for calling Egli (see above), a "spastic". Hewitt denied this.
Hewitt blamed his losses at the 2005 and 2006 Australian Open on uncooperative maintenance of the courts by the tournament directors. "I don't think there's been a lot of homework done on how the balls play on this surface ... Mate, it could be slower than the French Open." Hewitt was disappointed that the organisers had ignored his concerns about the courts. "I feel like I'm fighting with people that we should be working together to try and make Australian tennis better". Since then, long-time Australian Open chief executive Paul McNamee has resigned, leaving new tournament director Craig Tiley to confirm that the main aim for 2007 was to provide "uniformity and consistency" when the stadium's match and practice courts were resurfaced in November 2006. The courts will be as fast as they were in the second week of the 2006 tournament.
Hewitt is disliked by some Pro Tour players. Mary Carillo said: "He makes guys crazy, they try hard to ignore him, but he's always barking on the other side of the net." In his 2005 Australian Open match against Argentine Juan Ignacio Chela, Hewitt angered his opponent by his celebration of an unforced error, to the point where Chela served directly at Hewitt, and spat at him during the changeover.
In 2006 Hewitt was nominated by GQ magazine as one of the '10 Most Hated Athletes' in Sports. That year, he also came under criticism from Australian child psychologist Michael Carr-Gregg for "exploiting" his child during the 2006 Logie Awards. During a match at the 2005 Australian Open, David Nalbandian and Hewitt purposely bumped into each other at a change of ends. Nalbandian later remarked that "no-one on the tour is friends with Hewitt" and that Hewitt is "not a gentleman".
During the 2009 Wimbledon, Hewitt said that some of the female players on tour may not be fit enough to last five sets or be able to play seven best of five sets to win a grand slam. His remarks were seized upon by the local media and sparked instant men v women debate around the tennis circuit.
And there's a lot more than that. I wouldn't usually go bad-mouthing him but you asked and it's only a direct quote, nothing exaggerated. I'm especially happy for this win because Robredo seems like a very nice and genuine guy. In fact all Spanish players seem to be real gentlemen, hence I am partial to them winning (I also love their playing style).