Keys leads American charge into quarter-finals at Queen's Club; Khachanov sails in Den Bosch

Second seed Madison Keys powered into the quarter-finals of the Queen's Club Championships with a 6-3 6-2 win over Anastasia Zakharova on Wednesday while fellow Americans Emma Navarro and Amanda Anisimova also progressed.

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Australian Open champion Keys had an early wobble in the opening set in her first grasscourt match of the season when she found herself 3-1 down as she tried to find her footing.

But she did not panic and quickly recovered to win the next five games, sealing the set with an ace straight down the middle.

Zakharova had her moments in the second set but could not contend with the power of Keys, who converted five break points and clinched victory with an unreturned serve to wrap up the contest in 68 minutes.

"Always tough to play your first match on the grass, especially against someone who's already played a few matches. But overall, pretty happy and happy that I get another match here," Keys said.

"The first couple of games felt like I was just trying to find my footing. Once I did, I feel like I played really well."

Third seed Navarro overcame a nightmare opening set and also saved match point to beat Brazil's Beatriz Haddad Maia 1-6 7-6(4) 6-3.