British number one Johanna Konta has been knocked out of the Miami Open in the fourth round by three-time champion Venus Williams.

Defending champion Konta, ranked 14th, won the first set but eventually lost 5-7 6-1 6-2.

The 26-year-old had beaten world number eight Williams in straight sets in the semi-finals 12 months ago.

Williams, 37, will play Monica Puig of Puerto Rico or fellow American Danielle Collins in the quarter-finals.

Konta saved set point to turn the first set – which lasted just over an hour – in her favour and take the early advantage.

But Williams, a 10-time Grand Slam singles champion, cruised through the second set to even the score, with Konta requiring a medical timeout before the deciding set.

The Briton hit three aces in a row to save a break point in the third set, but Williams continued her dominant comeback to serve for the match.

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Elsewhere, US Open champion Sloane Stephens eased past Spanish third seed Garbine Muguruza to reach the last eight.

American Stephens – seeded 13th – wrapped up a 6-3 6-4 victory in one hour and 28 minutes.

Germany’s Angelique Kerber joined Stephens in the quarter-finals after defeating Yafan Wang of China 6-7 (1-7) 7-6 (7-5) 6-3, while Belarusian Victoria Azarenka beat Agnieszka Radwanska of Poland 6-2 6-2.

Fourth seed Elina Svitolina of Ukraine also advanced with a 7-5 6-4 win over Australian Ashleigh Barty, as did Czech Republic’s fifth seed Karolina Pliskova after Zarina Diyas of Kazakhstan retired hurt while trailing 6-2 2-1.

Great Britain’s Alfie Hewett says he fought off tiredness to play some of his “best tennis” and win a first Super Series wheelchair title.

The 20-year-old world number one beat Japan’s Shingo Kunieda 6-3 7-6 (8-6) in the Cajun Classic final on Sunday.

Hewett, who won his first Grand Slam singles title at the French Open last year, did not drop a set in the event.

“Not dropping a set is a very big thing for me, so I can go home very, very happy,” he said.

The Cajun Classic tournament, which is held in Baton Rouge in the United States, has been upgraded to Super Series status this year, becoming one of the six most prestigious wheelchair tennis events outside the four Grand Slams.

Hewett strengthened his position as world number one with victory over two-time Paralympic champion and reigning Australian Open champion Kunieda.

“He’s beaten me the last couple of times so I was really up for today, even though I felt tired,” said Hewett. “I really wanted to get on court and prove a point.

“He’s had a really good start to the year and played some his best tennis for a long, long while.

“I knew it was going to be tough and I came out and played some of my best tennis.”

British number one Lucy Shuker partnered Diede de Groot of the Netherlands to win the women’s doubles title.

Shuker and De Groot, seeded second, fought back from 5-2 down in the deciding set to win 2-6 6-3 7-5 against Dutch top seeds Marjolein Buis and Aniek van Koot.