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John McEnroe has admitted that he has no issue with players taking performance-enhancing drugs so long as they are not banned.
The American was speaking after the news broke that Maria Sharapova tested positive for meldonium, a drug most commonly used to treat people with a heart condition.
The Russian claimed she had taken the drug for 10 years to treat various illnesses and only tested positive for it after it was placed on the banned list on January 1st.
The 29-year-old said she didn't notice the multiple warnings that the drug was about to be prohibited and McEnroe sees no problem with any players using performance-enhancers so long as they're legal.
"If a drug is legal? That is like a no-brainer. I mean, are you kidding?" McEnroe told BBC Sport.
"People have been looking since the beginning of time for an edge, and you're constantly looking for these things in any way, shape or form.......if people feel they are getting an edge, and someone else isn't, that's just the way it is."
Former player Pam Shriver believes Sharapova's support team are to blame for not noticing or failing to act on, meldonium's newly banned status.
"In this day and age of the athlete there has to at least be someone on
the team responsible for doing a double-check," she said. "This is so important.
"In the scheme of the importance of this matter, it's so vital that it's
worth a lot more than just five to 10 minutes to fish through a website
or a newsletter."