No the mono crap is back again
Fed's mono problem, however much of a factor the past, is a fact.
That said, I think it was just a relative minor factor in his unevitable decline.
It's kind of hilarious to think that a player having reached 30+ of age, 1000+ matches played on ATP level, a ridiculous mileage of some complete DECADE within the top-3-4 of the ATP records, wouldn't have declined by now.
Some folks over here indeed seem to believe in 'eternal life'.
Wow to you, folks.