The Australian is hoping to find some rhythm by the time the French Open rolls around.
Raonic was forced to withdraw before his match against Marin Cilic in Monte Carlo.
Other players are set to begin their French Open prep in Lugano, Marrakech and Bogota.
The Australians knee is hurting, but hes still competing in Houston (on Tennis Channel).
The Australianstar turned 23 on Friday.