A story posted in the publication Alo.RS, quoted former German Davis Cup captain Niki Pilic as saying that Alexander Zverev had used the medication meldonium for diabetes. The 18-year-old German denied that report on Friday at Indian Wells.

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The website tennisworldusa.org had previously translated the article into English.

Zverev was asked about the article on Friday during his press conference after a first-round win over Ivan Dodig.

“I have absolutely no idea what Meldonium is,” he said. “I honestly never took it. I do not know where that is even coming from. I have no idea what that substance even is, and everything that has been there [in the article] is absolutely not true.”

The German added: “I am getting tested with doping, you know, almost every week, so, you know, if I would be taking that substance which is not allowed, there would be bigger news than just that little article.”

He was asked by a journalist if he had diabetes, as Pilic’s quote had mentioned.

“Everything that is in it that [article] is not true,” he said. “Everything that is in that news is absolutely, you know, made up.”