Novak Djokovic said on Tuesday that Rafael Nadal was his favorite to win the French Open, despite the record 14-time champion struggling for fitness in the twilight of his career.

World number one Djokovic is tuning up at the Geneva Open this week before the second Grand Slam of the year begins in Paris.

He said if Nadal was in the French Open draw, he could not be ruled out, despite his injury problems and growing competition from a younger generation.