#1 Romelu Lukaku

Once again, Romelu Lukaku struggled to inspire his side against a top-six opponent. Chris Smalling, Victor Lindelof, Phil Jones, Paul Pogba and Fred all let their manager and Manchester United down, but Lukaku's contribution or lack thereof was probably the main reason for United's defeat.
Almost invisible on the pitch, Lukaku struggled to hold the ball up or buy time for his midfielders even for a few seconds. Secondly, Spurs' center-backs snatched the ball off him and out-muscled him with ease.
The striker also offered no movement in attack. It almost seemed like there was no hunger from his side. When he finally did have a chance to score, the Belgian missed an open goal.
Had he involved himself more, shown more desire and finished off his chances, Mourinho's side could have found a way back in the game.