Spain's Rafael Nadal in action during the first round Action. [Photo/Agencies]

Grigor Dimitrov came out the latest highly seeded casaulty as the 10th seed Bulgarian was beaten 7-6 (7), 6-2, 6-3 by Jack Sock of the United States to suffer his second straight first-round exit in Paris.

In the women's play, top seed and world No. 1 Serena Williams claimed a quick victory of 6-2, 6-3 over Czech qualifier Andrea Hlavackova in just 59 minutes.

The 19-time major winner, who twice lifted the Suzanne Lenglen Cup in 2002 and 2013, plays German Anna-Lena Friedsam in the second round.

There's no good news for the sixth seed Eugenie Bouchard, however, as the Canadian, last year's semifinalist, crashed out by local sweetheart Kristina Mladenovic, 6-4, 6-4.

With Wang Qiang beaten by former champion Francesca Schiavone on Tuesday all four Chinese players have been stopped in the first round of the French Open.

Wang, ranked 102nd in the world, was dominant in the first set, broke the 2010 champion twice to win 6-3, but the 35-year-old Schiavone, who has slipped to 92nd, fought back to take the next two sets 6-3, 6-4 after two hours and nine minutes.

It was the Chinese player's first match at Roland Garros and at 23 she has learned it is too difficult to emulate compatriot Li Na's achievement at the red clay Grand Slam event.

"I was very exited and nervous," Wang said. "In China, I don't have any chance to play on clay. I just found it very different from playing on hard court."

Wang was the last Chinese player to exit at this year's tournament, following the suit of Peng Shuai, Zhuang Shuai and Zheng Saisai.

China will just be represented by doubles specialist Zheng Jie in the mixed doubles event and Xu Yifan, Zheng Saisai and Liang Chen in the women's doubles at Roland Garros in the following 10 days.