CHOICEmichaelcalvin

Roger Federer couldn't figure out why he felt so sluggish at the start of this season. His doctors eventually gave him an explanation: The world's No. 1 tennis player had mononucleosis.
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"Roger found out he had mono, and didn't know it. He found out a couple of weeks ago. That's probably what was wrong with him,"

Federer's agent, Tony Godsick, said Friday. "He doesn't want to make any excuses and take anything away from anybody. In hindsight, had [his doctors] known he had mono, they wouldn't have let him play." Federer lost to eventual champion Novak Djokovic in the Australian Open semifinals in January, then didn't play again until this week, when he was upset by Andy Murray in the first round of the Dubai Tennis Championships. Federer had not lost in the first round of a tournament since 2004 .

Q: Who was the famous sports player that got Mononucleosis?

Q: In what way did it affect how he played?