Rafael Nadal and Serena Williams were drawn as top seeds in the upcoming French Open 2014, which is set to start on Sunday.

Nadal, who is aiming to win his ninth French Open title, will have a tough road to the championship this year since he could face all three players, who defeated him on clay this season.

The top-seeded Nadal, who will kick off his campaign against Robby Ginepri, could face No. 21 Nicolas Almagro in the fourth round, No. 5 David Ferrer in the quarterfinals, and No. 2 Novak Djokovic in the finals.

Ferrer, who was the runner-up to Nadal in last year's Roland Garros finals, scored an upset against the current world No. 1 in the Monte Carlo quarterfinals last month.

The loss to Ferrer was followed by another disappointing loss to Almagro in Barcelona. Djokovic then worsened Nadal's woes on clay after scoring an impressive win in the Rome final on Sunday.

"Those are opponents that know how to play well on clay," Nadal said, reported ESPN. "But it's never easy."

Nadal's recent losses on clay were all best-of-three-set matches, which is different from the best-of-five-set format in the French Open. When asked whether or not the length of matches will give him an advantage, Nadal insisted that winning or losing this year's French Open title will have nothing to do with the number of sets every match.

"I give my most every point, every game, every set. Whether it's three or five, if you want to win, you have to play well," Nadal said.

The other possible quarterfinal matches in the men's side are Djokovic vs. eighth-ranked Milos Raonic, third-seeded Stanislas Wawrinka vs. seventh-seeded Andy Murray, and fourth-seeded Roger Federer vs. sixth-seeded Tomas Berdych.

On the other hand, top-seeded Serena Williams could face seventh-seeded Maria Sharapova in the quarterfinals, which could also feature matches between second-seeded Li Na and sixth-seeded Jelena Jankovic, third-seeded Agnieszka Radwanska and eight-seeded Angelique Kerber, and fourth-seeded Simona Halep and fifth-seeded Petra Kvitova.

Williams, who defeated Sharapova in last year's final, could also face her older sister, Venus, in the third round. The Williams sisters met in the 2002 finals, wherein in Serena won her first French Open title.