Zheng easily conceded the first set 6-1 despite managing a break in the fifth game, before making adjustment in the followed-up set to stay ahead at 5-4. Then Wang steadied her nerves to bag three games in a row and secure her win with a precise backhand.

Another Chinese player Zhu Lin failed in her maiden Roland Garros main draw appearance with a 6-1, 6-1 loss to Romania's Irina-Camelia Begu.

Following three consecutive five-set thrillers en route to quarterfinals last year, men's singles fifth-seeded Alexander Zverev nailed another marathon victory over John Millman of Australia 7-6 (4), 6-3, 2-6, 6-7 (5), 6-3.

"Very difficult to play today. But it's great that I came through, and this is the most important," Zverev pointed out.

No. 8 seed Juan Martin del Potro shrugged off a sluggish start to see off Nicolas Jarry 3-6, 6-2, 6-1, 6-4.

He was followed by Fabio Fognini, as the ninth seed eliminated his fellow Italian Andreas Seppi 6-3, 6-0, 3-6, 6-3.

No. 10 seed Karen Khachanov and local favorite Gael Monfils also reached the second round in straight sets.

The 11-time winner Rafael Nadal and Swiss veteran Roger Federer headline Wednesday's second round in men's singles.

China's Zhang Shuai will meet Estonian veteran Kaia Kanepi in the women's singles second round, before partnering Austrailian John Peers for mixed doubles opener.

Zheng Saisai hopes to make some redemption with Duan Yingying in the women's doubles action, also featuring Han Xinyun/Wang Yafan on Wednesday.

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