the mono effect would reappear here and there, which affected his mental composure

Jack,
I'd not go that far. That he intentionally lost fearing Murray is unethical and no player would that, esp. if your goal is to finish the year no. 1 and surpass Sampras' record. In 2008, he was occasionally physically incapacitated (the mono effect would reappear here and there, which affected his mental composure, but in Montreal, it was more lack of concentration and carelessness. That is just my opinion. 

http://bleacherreport.com/articles/236474-tsonga-stunned-roger-federer-in-quarter-of-montreal-masters-rogers-cup