15th seed Sloane Stephens raised American morale at the French Open by easing past Slovenian Polona Hercog 6-1 6-3 on Thursday to reach the third round.
Last year’s runner-up David Ferrer of Spain, the fifth seed, edged past Italian Simone Bolelli 6-2 6-3 6-2.
The fifth seed, who could take on eight-times champion Rafa Nadal in the quarter-finals, will next play Argentine Juan Monaco or Italian 32nd seed Andreas Seppi.
