Stephens, who reached the Australian Open semifinals in January with a win over Serena Williams, beat Kiki Bertens of the Netherlands 4-6, 6-3, 6-2.
WSJ: Back Might Keep Andy Murray Out of French Open Tennis
2.
China's Li Na, seeded fifth, was also making a return after spending six weeks on the sidelines with an ankle injury but she eased past Dutchwoman Kiki Bertens 6-3 6-1.