Drug Testing in Professional Tennis

Top players including Federer support a better more intense system for drug testing players.

The best players know it is in their interest to make sure no one is cheating both for their personal results and for the long term protection of the sport.  Since they have skin in the game I'd say that it is a good idea to listen to them.  One great thing about professional tennis is that the top players do have a lot of influence in things like this.

I suppose this focuses specifically on performance enhancing drugs such as steroids that may give an advantage to an athlete over one that doesn't use these.  If so, yes, testing is a good idea for these substances.  As for recreational drugs I don't see them as any advantage since tennis really does require your full physical abilities and mental acuity.