The basketball star was convicted last year in a Russian court on drug charges, months after police found cannabis oil in her luggage the Moscow airport. Despite Griner maintaining that she had been prescribed the oil to treat pain, she was sentenced to nine-years in prison.
She was released in December in a surprise prisoner swap with notorious arms dealer Viktor Bout.
Griner spent about 18 months away from competitive basketball before returning to action with the Mercury at the beginning of the season.
The star picked up where she left off, averaging 18 points and six rebounds per game. However, the Mercury are struggling to win games.
They are currently 6-18 this season, putting them in 10th place in the 12-team league.
