Jastremska was shut down in January after a doping test showed traces of the anabolic steroid mesterolone.
A decision that was appealed to Cas after Jastremska claimed that some form of contamination had occurred.
The suspension is thus fixed, until the International Tennis Federation announces its verdict, according to a statement from Cas.
CLIP: Quarantine training with Elias Ymer (January 29, 2021)
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Quarantine training with Elias Ymer