oxygen" and that it "allows athletes to train under maximum strain". Don Catlin, a long-time anti-doping expert and the scientific director of the Banned Substances Control Group (BSCG) stated that "There's really no evidence that there's any performance enhancement from meldonium – Zero percent." Sharapova said that she had been taking the drug to treat magnesium deficiency, an irregular EKG and family history of diabetes, and indicated that she had not read an email informing her that meldonium had been banned for use in tennis. Meldonium's addition was outlined on a WADA and United States Anti-Doping Agency summary document and it has been reported that all tennis players were warned five times that it was due to be banned. On March 11, 2016, Sharapova denied reports about the five missed warnings via Facebook: That's a distortion of the actual "communications" which were provided or simply posted onto a webpage. I make no excuses for not knowing about the ban. The other "communications"? They were buried in newsletters, websites, or handouts (many of them technical, in small print). I didn't take the medicine every day. I took it the way my doctor recommended I take it and I took it in the low doses recommended. I'm proud of how I have played the game. I have been honest and upfront. I won't pretend to be injured so I can hide the truth about my testing. Most fellow tennis players reacted to Sharapova's announcement with little support or sympathy. John McEnroe and Pat Cash said they found it hard to believe her. Jennifer Capriati posted on Twitter that she should be stripped of her 35 professional titles. Chris Evert expressed her surprise at the lack of support in tennis for Sharapova, noting that she "[had] always isolated herself from the rest of the tennis world, from the players". Serena Williams expressed surprise at Sharapova's announcement but commended her for being "upfront with what she had done". Roger Federer, Rafael Nadal and Andy Murray all publicly condemned Sharapova and argued that she deserved to be punished on the basis that she failed the doping test, with Murray adding that "Taking a drug you don't necessarily need because it's legal is wrong" and Federer stating that "Whether it's intentional or not, I don't see too much difference. You must be 100 percent about what you are taking". Sharapova's case prompted Federer to urge the