Last year’s Wimbledon runner-up Nick Kyrgios withdrew from the Halle Open on Monday in his latest setback as he tries to recover from a longstanding knee injury.

«I tried everything here in Halle the last few days, but then I had to make the decision to withdraw,» Kyrgios said in a statement on the tournament’s website. «I want, when I play, to put in a performance like last year when I was in the semifinals. But that really won’t be possible.»

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Australian tennis player Nick Kyrgios (right) leaves Magistrates Court in Canberra on February 3, 2023. – Kyrgios pleaded guilty on Friday to assaulting his then-girlfriend by pushing her to the ground in January 2021. (Photo by SAEED KHAN/AFP via Getty Images)

Tournament organizers said Kyrgios was «still suffering from the aftermath of a complicated knee injury that sidelined him for around seven months», adding that he felt a recurrence of the knee problem while training in Halle.

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Novak and Kyrgios after Wimbledon

Winner Novak Djokovic of Serbia (L) and runner-up Nick Kyrgios of Australia pose for a photo with their trophies after their men’s singles final match on day fourteen of the 2022 Wimbledon Championships at the All England Lawn Tennis and Croquet Club on 10 July 2022 in London, England. (Julian Finney/Getty Images)

Kyrgios, who underwent knee surgery in January, returned to action last week for the first time since October in a straight-set loss to Wu Yibing at the Stuttgart Open on grass.

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Nick Kyrgios speaks during a press conference

Nick Kyrgios of Australia speaks during a press conference during a practice session ahead of the 2023 Australian Open at Melbourne Park on January 14, 2023 in Melbourne, Australia. (Photo by Kelly Define/Getty Images)

Halle is another grass event seen as a warm-up for Wimbledon. The Australian was due to play Lorenzo Sonego in the first round and his place has now been taken by former Australian Open semifinalist Aslan Karatsev.