Top seed Novak Djokovic and nine-time champion Rafael Nadal eased through to the French Open second round with comprehensive victories.

Djokovic, a defeated finalist in three of the last four years, beat Chinese Taipei's Yen-Hsun Lu 6-4 6-1 6-1.

Nadal, the 29-year-old Spanish fourth seed, took only one hour and 20 minutes to overcome Sam Groth 6-1 6-1 6-1.

Earlier, Australian Open champion Angelique Kerber was beaten by world number 58 Kiki Bertens.

Nadal, who hit an astonishing winner through his legs in the third set, will face Argentine world number 99 Facundo Bagnis in the second round after taking his career French Open record to 71 wins and two losses.

Djokovic will face Belgian Steve Darcis next, ahead of a potential third-round encounter with British number two Aljaz Bedene in the third round.

Seventh seed Tomas Berdych brushed aside Vasek Pospisil in straight sets in the opening match on court one.

Andy Murray completed his comeback from two sets down to beat Radek Stepanek 3-6 3-6 6-0 6-3 7-5, but it was not without some nervy moments.

Murray was two points away from being knocked out at 5-4 down in the fifth set but then went on to break for 6-5 before holding to 30 to reach the second round.

In a thrilling final set which went to serve until 5-5, neither was able to make significant inroads on the other's serve, though the British No 1 passed up a number of break point opportunities.

With the 37-year-old Czech belying his advancing years, the world No 2 was forced to dig deep in an enthralling encounter, before a tame Stepanek backhand went into the net at 30-40 to hand Murray the chance to serve for the match.

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