Easy 10
Brain dead MUG SHEEP
Laughable to suggest a tennis player is at the pinnacle of health and fitness
They are nearly always carrying some sort of injury given the brutal nature of the sport
Not really a surprise they need to take certain things which amateur athletes wouldn't bother with
Sorry, I don't see whats "laughable" about it at all. A tennis player is a supreme athlete, that is without question, it is probably the most physically demanding non-contact sport there is. But needing to take "certain things" as you put it, creates a very blurred line between drugs that aid recovery, and drugs that enhance performance.
And I'm sorry, but ignorance on the athletes part is no excuse whatsoever. If they don't know whats being put into them, then that is their fault for being too lazy/reliant on the people with the tablets and the needles. They know the risks, and the punishments, so its their duty to know precisely what it is they are on, and whether it is legal.