Foes still wary of Nadal's French fluency

For the past 10 years Rafael Nadal has been virtually unbeatable at Roland Garros, but that could all change at this year's French Open as the Spaniard's woes continue on clay.

Nadal, stunned in the final of the Madrid Masters a week ago by Britain's Andy Murray, has won only one tournament - Buenos Aires - on his favorite surface this year.

Having already lost twice this year to Italian Fabio Fognini, Serbian rival Novak Djokovic and Murray, the 14-time Grand Slam winner was eliminated from the quarterfinals of the Italian Open by Stan Wawrinka, who also beat Nadal for the Australian Open title in 2014.