History also has taught us that if a sport hides rather than confronts, the circumstantial will soon overwhelm the truth. The nonsense of trying to determine which players dope simply through body type, comportment and playing style will become irrefutable fact. The muscles of Serena Williams and Samantha Stosur will be proof of their guilt, as will Djokovic's remarkable stamina and Errani's and Ferrer's unexpected success; Alexandr Dolgopolov weighs only 160 pounds and Roger Federer is a nice guy, so they will be thought clean.
If the players wish to avoid the witch-hunt dynamic that ruined baseball, this is the time to act. During the Australian Open, both men's finalists, Djokovic and Andy Murray, called for increased blood testing and more frequent out-of-competition testing. It was a definitive stance from two of the game's top players -- a stance that none of baseball's best chose to adopt. But in so doing, Djokovic and Murray openly revealed the huge testing loopholes that exist.
link of espn article in OP
not a bad article. it somewhat defends the players who are accused of doping based on speculation.
this is the state of tennis in regards to doping. without sufficient transparency from the top down, there is only speculation to base the answers on when the questions are brought up. the questions will probably always be there. the only way to save players from unfair speculation is to have a change in the system, not the players, in the way testing is handled and the way results are provided. sadly as the article says, like it has happened in other sports, this change likely wont come until a retired Mark Mcguire type player folds. if that came about, the ATP/WTA & ITF are going to be in a lot more trouble than they would have been in the outset.