Tottenham fans have vented their fury after their 2-1 defeat to Newcastle on Sunday, with some calling on the north London giants to sack Ange Postecoglou. Spurs went into the clash hoping to build on last weekend’s emphatic victory over Everton. But Tottenham lacked a cutting edge against Newcastle, who picked up all three points courtesy of goals from Harvey Barnes and Alexander Isak. The result means Spurs have picked up just four points from a possible nine. Having fallen apart last season, some Tottenham fans have now demanded Postecoglou be relieved of his duties. “Sack Ange now before i…