Spurs made a flying start when Brennan Johnson tapped in from Micky Van de Ven’s storming run after three minutes.
Tottenham should have added to their lead long before United were reduced to 10 men when captain Fernandes was shown a straight red card on 42 minutes.
Dejan Kulusevski finally doubled the visitors advantage two minutes into the second half before Dominic Solanke rounded off the scoring.
Ten Hag began the season under scrutiny after surviving an internal review at the end of last season.
A shock FA Cup final victory over Manchester City was widely credited with saving the former Ajax coach’s job after finishing eighth in the Premier League last season.
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