The Monte-Carlo Masters is an annual tennis tournament for male professional players held in Roquebrune-Cap-Martin, France, a commune that borders on Monaco. The event is part of the ATP Tour Masters 1000 on the Association of Tennis Professionals (ATP) Tour. The tournament is played on clay courts and is held every year in the April–May period. Beginning in 2009, Monte Carlo became the only Masters 1000 tournament not to have a mandatory player commitment. Most of the top players still elect to play the event despite this status.