The world number two, wearing a long-sleeved top despite the warm temperatures on Court Philippe Chatrier possibly due to the cold she has been suffering from, took a while to get into her stride but romped away from her 91st-ranked opponent.

Sharapova, who has won two of the last three French Opens and was beaten by Serena Williams in the 2013 final, broke serve in the first game but a double fault gifted Diatchenko a break back to 2-2.

Diatchenko then coughed up two double faults in the next game to hand the advantage back to Sharapova and another double fault brought a lukewarm first set to a conclusion.

Sharapova then powered through the second set in 35 minutes, offering up few errors.

Things will toughen up for the five-times grand slam champion in the next round when she faces Australia's Samantha Stosur, the runner-up in 2010 and twice a semi-finalist, who she beat in the fourth round last year.

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