Former world number nine Marin Cilic is free to play on the tennis circuit again after the Court of Arbitration for Sport cut his ban for doping by more than half.
The Croatian was originally banned for nine months by the International Tennis Federation in September for taking the banned stimulant nikethamide.
The 25-year-old, who said he had inadvertently taken the substance in glucose tablets, appealed to the CAS who ruled on Friday that the punishment had been too severe.
Cilic, who spent 11 weeks in the world's top 10 in 2010, tested positive for the substance at the BMW Open in Munich in April. He has dropped to 47th in the rankings.
