See main article: article and 2009 Monte-Carlo Rolex Masters.
Four-time defending champion Rafael Nadal defeated Novak Djokovic in the final, 6–3, 2–6, 6–1 to win the singles tennis title at the 2009 Monte-Carlo Masters. The set Nadal lost in the final was the first he had dropped at the tournament since the 2006 final.
The top eight seeds receive a bye into the second round.