Maria Sharapova will make her professional comeback at the Porsche Grand Prix on 26 April following her 15-month doping suspension.
The 29-year-old former world number one was given a two-year ban in March after testing positive for meldonium.
Her suspension was then reduced in October following an appeal.
The tournament in Stuttgart starts two days before the Russian's suspension runs out and she will not be allowed to attend until the day of her match.
Sharapova, whose main sponsor is Porsche, will return to tennis without a ranking and needs a wild card to enter the tournament.