Emma Raducanu has withdrawn from the Miami Open due to illness.
The 23-year-old British No 1, as the 24th seed had received a bye into the second round of the tournament, which begins on Tuesday.
But Raducanu is still recovering from post viral symptoms she picked up in the Middle East last month and made the decision to pull out of the tournament on Monday.
The 2021 US Open champion competed at Indian Wells earlier this month, suffering a 6-1 6-1 third-round defeat to Amanda Anisimova.
Speaking after that 52-minute loss, Raducanu admitted she could not summon the power to compete with the two-time grand slam finalist.
Raducanu cut ties with her latest coach Francisco Roig in January and has been working on an ad-hoc basis with Mark Petchey in a bid to rediscover her top form.
It is unclear where and when Raducanu will next been in action, with her recently also .
Kartal is now set to lead Great Britain at the event.
Raducanu has recently joined Japanese manufacturer Uniqlo as a brand ambassador after ending her association with Nike and wore her new sponsor's outfits for the first time at Indian Wells.
Uniqlo said in a post on Instagram: "Emma will champion UNIQLO's LifeWear philosophy, which is committed to pursuing excellence, making meaningful contributions to society, and empowering the next generation."
Raducanu said: "UNIQLO and I share many values and perspectives on life, culture, and society.
"I am excited to promote LifeWear through my tennis career, and to working with everybody at UNIQLO to inspire and engage young people everywhere."
In the WTA rankings, Raducanu sits at No 23. Her career-high ranking was No 10, back in July 2022.
News emerged in January that Raducanu is searching for a 10th coach in the last five years after
Raducanu announced she ended her partnership with Roig, who helped Rafael Nadal win 16 of his 22 Grand Slam titles, after less than six months together.
She has been assisted by LTA coach Alexis Canter since parting ways with Spaniard Roig, while she also linked up with Mark Petchey once again at Indian Wells.
Since her breakthrough at Wimbledon 2021 and that spectacular triumph at the US Open later that year, the longest period of time Raducanu has been with the same coach for is 13 months.
Raducanu made her return to competitive tennis in the United Cup in January but after which she revealed that she was unable to play for two and a half months due to an ongoing injury.
Her preparations for the Australian Open took a further hit after she was stunned 6-2 6-4 by Taylah Preston in the quarter-finals of the Hobart International, but she made a winning start at Melbourne Park a few days later.
Seeded 28th for the first Grand Slam of the year, Raducanu overcame Mananchaya Sawangkaew in the first round at the Australian Open only to suffer a .
Raducanu missed the chance to win her first title since her US Open triumph in 2021 .
Top seed Raducanu was feeling the effects of her marathon semi-final win against Ukraine's Oleksandra Oliynykova, losing out to Cirstea 6-0 6-2 in little over an hour in Cluj.
She then - just two days after losing the final at the Transylvania Open.
Raducanu had time to prepare for her tournament but she in the opening round at the Dubai Tennis Championships.
At Indian Wells, she breezed past Anastasia Zakharova in the second round,
So far, the 2021 US Open victory remains Raducanu's sole success in a major tournament. She reached the fourth round in Wimbledon that year - a feat she matched in 2024 and might have bettered were it not for injury - but at the Australian and French Opens, she has never progressed beyond the third round.
