Novak Djokovic was booed off court after retiring injured from his Australian Open semi-final against Alexander Zverev.
It ends the Serbian's pursuit of a 25th Grand Slam title.
Zverev won the first set, before Djokovic ended the match early - saying he was struggling with a "muscle tear" in his leg.
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The second semi-final will see reigning champion Jannick Sinner go up against America's Ben Shelton.
