Britain's Emma Raducanu has withdrawn from the Miami Open with a lower back injury, tournament organisers said on Tuesday, in the latest setback for the 21-year-old.

Raducanu spent eight months out with wrist and ankle problems last year but returned to action in January and had an encouraging performance at Indian Wells last week where she reached the third round.

"I have been experiencing lower back pain and at this stage of my return to competition I don’t want to risk anything happening," said Raducanu.

"I really tried my best to be ready and I’m sad to be pulling out of Miami as it’s a cool tournament but wish the event all the best."

The 2021 US Open winner, a wildcard entry at Miami, was scheduled to play China's Wang Xiyu in the first round on Tuesday.

Raducanu had surgeries on her ankle and both wrists during last year.

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She was beaten in the Indian Wells third round by world number two Aryna Sabalenka.

Wang will now face Slovakian qualifier Anna Karolina Schmiedlova.

Tuesday's action sees Romanian Simona Halep return to action after her four-year doping ban was reduced to nine months and she was cleared by the Court of Arbitration for Sport for an immediate return.

Halep, given a wildcard entry, will take on Spain's Paula Badosa.

Venus Williams takes on Russian Diana Shnaider in the first round.

Britain's Emma Raducanu has withdrawn from the Miami Open with a lower back injury, tournament organisers said on Tuesday, in the latest setback for the 21-year-old.

Britain's Emma Raducanu has withdrawn from the Miami Open with a lower back injury, tournament organisers said on Tuesday, in the latest setback for the 21-year-old. Raducanu spent eight months out with wrist and ankle problems last year but returned to action in January and had an encouraging performance at Indian Wells last week where she reached the third round. "I have been experiencing lower back pain and at this stage of my return to competition I don’t want to risk anything happening," said Raducanu. "I really tried my best to be ready and I’m sad to be pulling out of Miami as it’s a cool tournament but wish the event all the best." The 2021 US Open winner, a wildcard entry at Miami, was scheduled to play China's Wang Xiyu in the first round on Tuesday. Raducanu had surgeries on her ankle and both wrists during last year. ALSO READ | Fans in Hong Kong to receive 50% refund after Lionel Messi's absence during Inter Miami friendly She was beaten in the Indian Wells third round by world number two Aryna Sabalenka. Wang will now face Slovakian qualifier Anna Karolina Schmiedlova. Tuesday's action sees Romanian Simona Halep return to action after her four-year doping ban was reduced to nine months and she was cleared by the Court of Arbitration for Sport for an immediate return. Halep, given a wildcard entry, will take on Spain's Paula Badosa. Venus Williams takes on Russian Diana Shnaider in the first round.

Tennis: Britain’s Emma Raducanu withdraws from Miami Open with lower back injury

Emma Raducanu's "challenging year" suffered another hiccup after the former US Open champion pulled out of her scheduled comeback at an exhibition tournament next month in Macau.

The Briton, who turned 21 on Monday, has not played since April after undergoing surgeries on both wrists and also an ankle.

She had targeted the Macau Tennis Masters on December 2-3 for her return but her name was missing when the final field was announced on Monday, with organisers saying "injuries (led) to a revised line-up".

Raducanu stunned the tennis world two years ago when she won the US Open as a qualifier aged 18.

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But she has struggled for form and fitness since and is now ranked 289 in the world.

She is, however, back in training following her long injury layoff and is reportedly targeting the beginning of next year for her comeback.

The Australian Open begins on January 14.

"Regardless of a challenging year there's a lot to be grateful for," she wrote on Instagram as she celebrated her birthday.

"Looking forward to the next chapter."

Emma Raducanu's "challenging year" suffered another hiccup after the former US Open champion pulled out of her scheduled comeback at an exhibition tournament next month in Macau.

Emma Raducanu's "challenging year" suffered another hiccup after the former US Open champion pulled out of her scheduled comeback at an exhibition tournament next month in Macau. The Briton, who turned 21 on Monday, has not played since April after undergoing surgeries on both wrists and also an ankle. She had targeted the Macau Tennis Masters on December 2-3 for her return but her name was missing when the final field was announced on Monday, with organisers saying "injuries (led) to a revised line-up". Raducanu stunned the tennis world two years ago when she won the US Open as a qualifier aged 18. ALSO READ | Bayern Munich star Thomas Muller shows support for Indian team at World Cup; wears jersey & tags Virat Kohli But she has struggled for form and fitness since and is now ranked 289 in the world. She is, however, back in training following her long injury layoff and is reportedly targeting the beginning of next year for her comeback. The Australian Open begins on January 14. "Regardless of a challenging year there's a lot to be grateful for," she wrote on Instagram as she celebrated her birthday. "Looking forward to the next chapter."

Tennis: Former US Open champion Emma Raducanu delays comeback after 'challenging year'

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Tennis: Britain’s Emma Raducanu withdraws from Miami Open with lower back injury

Tennis: Former US Open champion Emma Raducanu delays comeback after 'challenging year'