Wimbledon title rivals Novak Djokovic and Jannik Sinner will move closer to a blockbuster semi-final showdown if they win their fourth-round ties on Monday as officals blamed human error for an embarrassing electronic line-calling blunder.

It took only seven points before the first forlorn shout of "C'mon Pedro" was warmly applauded by a Centre Court crowd who had already seen enough to know that Jannik Sinner was in for an easy Saturday afternoon at Wimbledon.