The WTA Tour has banned Stefano Vukov, Elena Rybakina’s former coach, from coaching and from obtaining credentials for professional tennis events. The organization did not specify the length of the suspension or how Vukov violated its rules, but two sources close to the investigation said it is a one-year ban. In a statement, the WTA said: “The WTA confirms that the independent investigation into a potential breach of the WTA Code of Conduct by Stefano Vukov has concluded. “Following this proces