British number one Kyle Edmund’s first match of the clay-court season lasted only 16 minutes as Jiri Vesely retired.

World number 26 Edmund, 23, was leading 5-0 in the first set of the first-round match in the Grand Prix Hassan II in Marrakesh when Czech Vesely withdrew.

It was Edmund’s first win since reaching the Australian Open semi-finals in January, having lost early on at Indian Wells and Miami.

Second seed Edmund will face Radu Albot or Andreas Seppi in the last 16.

Spain’s Albert Ramos-Vinolas, the top seed, earlier beat Moroccan wildcard Amine Ahouda 6-1 6-2, while fifth seed Robin Haase and seventh seed Alexandr Dolgopolov lost.

American Madison Brengle is suing the Women’s Tennis Association and the International Tennis Federation for injuries she alleges were caused by repeated anti-doping tests.

A medical condition that meant Brengle, 28, reacted badly to needle injections was ignored, says her lawyer.

Brengle has permanent swelling and weakness in her serving arm and hand and had to withdraw from tournaments.

The world number 83 is likely to seek more than $10m (£7m) in damages.

“Tennis authorities ignored evidence of her professionally-diagnosed condition and refused to provide alternative testing or a medical accommodation,” said lawyer Peter Ginsberg.

Brengle, who has won over $2.1m (£1.5m) in prize money, said: “I am bringing this action in an effort to force those who control the sport I love to understand that players are not commodities and should be treated with respect and dignity.

“The unbridled authority of officials to subject players to the kind of abuse I suffered cannot be tolerated; players must have a say in matters involving our health and safety.”

BBC Sport has contacted both the WTA and ITF for comment.

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Great Britain have been drawn at home to Uzbekistan for their Davis Cup play-off to stay in the World Group in 2019.

The tie will take place from 14-16 September with the losers dropping down into the Europe/Africa zonal group.

A first-round loss to Spain in February means GB will feature in the play-offs for the first time since joining the top-level World Group in 2014.

Injury ruled former world number one Andy Murray and Kyle Edmund out of that tie but both could return in September.

Uzbekistan have only Denis Istomin (83) ranked in the world’s top 300, while GB have Edmund (26) and Murray (30) in the top 100, with Cameron Norrie and Liam Broady ranked 103th and 154th respectively.