US Open champion Sloane Stephens has joined fellow American Madison Keys in the French Open quarter-finals with a storming fourth-round win over Anett Kontaveit.

Unlike her third-round escape against Camila Giorgi, Stephens never gave Kontaveit a sniff, winning the last 11 games to reach the last eight in Paris for the first time with a 6-2 6-0 rout on Sunday.

Stephens had fallen at the fourth hurdle five times previously but needed just 52 minutes to break through and set up a quarter-final date with either Australian Open champion Caroline Wozniacki or Russian 14th seed Daria Kasatkina.

Runner-up to Stephens at Flushing Meadows last year, Keys was the first woman through to the quarters after ending Mihaela Buzarnescu’s inspired run with a 6-1 6-4 victory over the Romanian.

The 13th-seeded Keys will play either Czech Barbora Strycova or Kazakh Yulia Putintseva for a place in the semi-finals.

Three-times champion Serena Williams can make it three Americans in the last eight if she beats Maria Sharapova on Monday.