Maria Sharapova was suspended for two years by the International Tennis Federation on Wednesday for testing positive for meldonium at the Australian Open in January.
The 29-year-old Russian tennis star, who has lucrative advertising contracts, said she will immediately appeal the suspension.
According to a statement on Sharapova's Facebook page, the ITF "unanimously concluded" that the tennis star "did not seek treatment from [her] doctor for the purpose of obtaining a performance enhancing substance."
"The ITF spent tremendous amounts of time and resources trying to prove I intentionally violated the anti-doping rules and the tribunal concluded I did not. You need to know that the ITF asked the tribunal to suspend me for four years — the required suspension for an intentional violation — and the tribunal rejected the ITF's position," Sharapova said.
She said she "cannot accept an unfairly harsh two-year suspension."