Manchester United produced an outstanding display to defeat Liverpool and give manager Erik ten Hag his first Premier League victory at a thunderous Old Trafford.   Ten Hag took the bold decision to drop captain Harry Maguire and Cristiano Ronaldo and was rewarded with a performance that lifted the mood of crisis around Manchester United and leave Liverpool still searching for a first win of the season.     Jadon Sancho showed superb control and composure to deservedly put United in front after 16 minutes before Marcus Rashford raced clear to beat Alisson from substitute Anthony Martial's pass eight minutes