Reports are coming in that the Croatian World number 15 Marin Cilic has failed a drugs test and is serving a three month suspension. This allegedly happened during the BMW open in Germany back in April. Cilic hasn't played since his second round withdrawal from the second round of Wimbledon citing “injury”. Radio New Zealand citing a Croatian news paper said that the positive test was due to "incautious use of glucose". The source of the information is Jutarnjilist.hr which is a national mass circulation newspaper. The international tennis federation and Cilic are yet to comment of this issue.
Reports of other fail drugs tests are also circulating but I will not mention any names unless more reliable sources that arises.