World No.3 Alexander Zverev has exploded at the chair umpire and officials during his Australian Open semi-final loss to Carlos Alcaraz on Friday. Alcaraz was serving at 4-4 in the third set when he dramatically cramped up at 15-15. Zverev, who earlier copped a time violation, fumed at chair umpire Marijana Veljovic for not beginning the serve clock. Despite the dramatic situation, Zverev won the third set and then the fourth to force a deciding fifth set. The German looked on track to complete the comeback when he broke Alcaraz in the first game of the final set.