Novak Djokovic has retired from his Australian Open semifinal against Alexander Zverev after losing the first set in a tiebreak. Djokovic missed a regulation putaway volley on top of the net down 5-6,

Novak Djokovic sent a heartfelt message to Alexander Zverev moments after the world No. 2 lost the Australian Open final. Zverev advanced to the championship match when Djokovic retired from their semi-final. At the time, the Serb said he’d be cheering for his rival to lift the trophy.

Alexander Zverev chided the crowd after they booed Novak Djokovic for retiring due to injury after the first set in an Australian Open semifinal.