I honestly have a hard time taking the idea of doping in tennis seriously. Like...it's tennis haha, not running or cycling. I can imagine the effects of doping in tennis are much less significant than they are in an actual endurance sport. You gotta be really desperate if you're doping in tennis haha, are old golfers with dad bods out there doping too?? Lol.
Doping is not just to make you stronger or faster .... it aids in recovery from workouts and injuries. Look at how Djokovich and Nadal both came back from his injuries in their 30's to become even BETTER than they were before! And never mind Nadal's physical transformation over his career (think Barry Bonds with the Pirates to Barry Bonds at the end of his career with the Giants). Not buying it.