The verdict in Maria Sharapova’s appeal against a two-year doping ban will be announced by the Court of Arbitration for Sport (CAS) on Tuesday.
Five-time grand slam winner Sharapova was banned by the International Tennis Federation (ITF) in June 2016 following a positive test for the banned drug meldonium during January’s Australian Open.
The former world number one from Russia is seeking to have her suspension wiped out or reduced.
She had called the ITF’s ruling “unfairly harsh” as an independent tribunal had found that she had not intentionally violated anti-doping rules.
Sharapova admitted taking meldonium during the season’s opening grand slam in Melbourne but said she had been unaware that it had been banned by the World Anti-Doping Agency (WADA).
Meldonium was added to WADA’s list of banned substances at the start of the year after mounting evidence that it boosted blood flow and enhanced athletic performance.