@ thesecondlaw
I think you are being unfair to Sharapova. Such is her willingness to work and train hard renders her more susceptable to various injuries such as here:
This isn’t the first time Sharapova’s had problems with her shoulder. Five years ago she underwent surgery to repair her rotator cuff, causing a 10-month break from the tour and withdrawal from the 2008 U.S. Open.
This week Sharapova shared her thoughts in a Facebook post: “Withdrawing from the U.S. Open has been a really tough decision to make. I have done everything I could since Wimbledon to get myself ready, but it just wasn’t enough time. I have done many tests, received several opinions, and it all comes down to taking the proper amount of time to heal my shoulder injury properly.”
Sharapova announced on Friday that she had injured her arm and therefore would not be fit to play later this month in a tournament in California.
Some people are just injury prone. Bryan Robson was notorious. It didn't mean that he was a drug taker.
I think your suspicions over other tennis players are unwise and views like this do nothing except to denigrate world sport and spread distrust of the majority of sportspeople who are clean.