COCO GAUFF was sent crashing out of the Canada Open in Montreal in straight sets by teenager Victoria Mboko on Saturday.

The 18-year-old from Canada, ranked 85 in the world, needed just 62 minutes to beat the top seed 6-1 6-4 and book a place in the quarter-finals.

“It’s incredible,” she said on court after her victory. “I’m so happy to beat such a great champion.”

Mboko made her WTA Tour debut in March and took Gauff to three sets in Rome in her second event.

She raced through the first set in 25 minutes, breaking the American three times.

The second set was a tighter affair which went on serve for the first 11 games.

Gauff failed to convert three break points throughout the set, Mboko seizing on her sole opportunity to close out the victory.

World number two Gauff said: “I think she’s going to have a lot of success on tour. I’m sure we’re going to have many more battles in the future.”

She will face Jessica Bouzas Maneiro in the last eight today after the Spaniard beat China’s Lin Zhu 7-5 1-6 6-2.