Maria Sharapova set up a grudge match against Eugenie Bouchard with a first-round win at the Madrid Open on Sunday.
Canadian Bouchard called Sharapova "a cheater" prior to the Russian's return to competitive action in April after a 15-month doping ban.
Bouchard, who beat Alize Cornet on Saturday, believes the five-time Grand Slam winner should be banned for life.
Sharapova beat Croat Mirjana Lucic-Baroni 4-6 6-4 6-0, which comes after reaching the semi-finals in Stuttgart.
The 30-year-old, who won this tournament in 2014, will take on world number 59 Bouchard on Monday.