Tipsarevic is lazy. Reads a lot of literature which I appreciate, but he sacrifice tennis practice for that. Tsonga will be force. He plays incredible. Huge potential.
And the reason he didn't perform well were his injuries, something he couldn't really control, not his mentality. His mentality looks very strong.
It wasn't completely out of his control either, his coach Winogradski admits it was Tsonga's fault too when he got injured that much. Not enough discipline for a while (he's very fond of his food!)
But that definitely shouldn't be an issue anymore, everybody is praising him now for having learned a lesson from it and being very, very careful in that regard.
(From an article about him in L'Equipe during the AO: (...) Dame blessure repointe sa sale dégaine. Et elle n’est pas venue seule. Car Jo a un vilain défaut, la gourmandise. « Ça cassait souvent, explique Wino, parce qu’il n’était pas capable de faire quinze minutes de gainage par jour ni de manger un peu correctement pour perdre du poids. »