Williams sisters out of doubles; Stephens in last 8

The Williams sisters, Venus and Serena, were ousted of the French Open doubles tournament on Sunday after the third-seeded pairing of Andreja Klepac and Maria Jose Martinez Sanchez beat the Americans 6-4, 6-7 (4), 6-0 to advance to the quarterfinals.

Serena Williams plays Maria Sharapova on Monday for a place in the women's singles quarterfinals.

Earlier, American Sloane Stephens advanced into her first quarterfinal at the French Open, having stalled in the fourth round on four previous occasions.

Stephens, the US Open champion in 2017, blew past Anett Kontaveit of Estonia 6-2, 6-0 in just 52 minutes on Court Philippe Chatrier.

The 25th-seeded Kontaveit was unable to exert any pressure on the 10th-seeded Stephens with her error-strewn game.

Stephens faced no break points.

Kontaveit made 21 unforced errors and hit just six clean winners.

Madison Keys is thinking big at the French Open after reaching the quarterfinals for the first time.

Her feat means the 13th-seeded American has now reached the last eight at every major.

"I made the final of the US Open but lost to my friend Sloane Stephens," the 23-year-old Keys said. "Hopefully big things can happen here."

After beating No 31 Mihaela Buzarnescu of Romania 6-1, 6-4, she next faces either No 26 Barbora Strycova of the Czech Republic or Yulia Putintseva of Kazakhstan.

They were playing their match later Sunday on Court Suzanne Lenglen.

US Open runner-up Madison Keys has reached the quarterfinals of the French Open for the first time by beating Mihaela Buzarnescu of Romania 6-1, 6-4.

On a sunny Court Philippe Chatrier, the 13th-seeded American had two match points at 5-2 and 40-15. But Buzarnescu fought back to break Keys and then clenched her fist after holding for 5-4.

Serving a second time for the match, the 23-year-old Keys let out a scream of "Come on!" when she hit a superb cross-court backhand winner to make it 40-15 and give herself another two chances for victory.