Former top-10 tennis player Marin Cilic's ban for doping has been reduced to four months from nine months and he can take part at the Paris Masters next week.
The Court of Arbitration for Sport (CAS) says the International Tennis Federation (ITF) ban was "too severe in view of the degree of fault".
The 25-year-old Croatian tested positive for the banned stimulant nikethamide at a tournament in Munich in May.
Cilic claimed he did not intend to ingest the substance in glucose tablets and challenged his ban at CAS.
The ITF requested a two-year ban from CAS by appealing the verdict of its own independent tribunal.
Cilic's world ranking peaked at No.9 in February 2010, and dropped from 12 to 47 since accepting a provisional suspension in June.
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