The Latvian will face Maria Sharapova or Daria Gavrilova in the quarter-finals in Rome as British number one Konta slumped to a fifth straight defeat against a top-10 player.

WTA Adelaide International
Konta knocked out of Adelaide International in last-16

The world number 22 Konta led 4-1 in the first set in only 17 minutes, but could not maintain the momentum on her 27th birthday.

Konta played well, but will be concerned about her inability to build upon a promising start.

This was the fourth straight match when she has blown a first-set lead against an opponent ranked inside the world's top 10.

World number one Simona Halep was given a walkover after Madison Keys withdrew due to a rib problem.

Halep will extend her stay as world number one as a result.

Halep needed to reach at least the quarter-finals and go further than world number two Caroline Wozniacki to retain the top-ranking going into the French Open.

Keys, runner-up in Rome in 2016, was unable to take to court because of a right rib injury.

"I felt my rib in my match yesterday and after trying to warm up this morning it was still painful," she said.

Halep, runner-up last year, will play either Sloane Stephens or Caroline Garcia in the last eight

Defending champion Elina Svitolina overcame Russian Daria Kasatkina 0-6 6-3 6-2.

Eighth seed Venus Williams crashed out as she was beaten by Anett Kontaveit in straight sets 6-2, 7-6(3).

Venus struggled to get going and she was broken in the third game as Kontaveit took control of the opening set.

The seven-time Grand Slam winner responded well in the second but Kontaveit forced the game to a tie-break, where she progressed to the next round.

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