His withdrawal helps Djokovic in his bid to win an eighth title at Wimbledon and move level with Roger Federer.

He has now moved into a 13th Wimbledon semi-final - a joint Open era record with Federer.

Djokovic has looked in excellent form at SW19, despite undergoing knee surgery just three weeks before the grass-court Grand Slam.

He made light work of 15th seed Holger Rune in the quarter-finals.

In his on-court interview afterwards, he accused fans of disrespecting him, saying they used a Rune chant as "an excuse to boo".

Wimbledon organisers have filled the slot on Centre Court with a second-round mixed doubles match featuring British duo Joe Salisbury and Heather Watson, who take on Jan Zielinski of Poland and Taiwan's Hsieh Su-wei.

That will be followed by a women's invitational doubles match, with Australia's Ashleigh Barty and Casey Dellacqua playing Germany's Andrea Petkovic and Magdalena Rybarikova of Slovakia.