Manchester United boss Jose Mourinho is "amazed" by the top six battle this season.
He acknowledged clashes between the top teams have taken on extra significance compared to when he won three titles with Chelsea or when Leicester caught everyone cold last season.
"It's amazing," he said. "Last season Leicester made incredible history but the top clubs underperformed.
"My team (Chelsea) was underperforming. Man United was underperforming. Man City was underperforming.
"But this season you have weekends where all the top six are winning. To drop points sometimes you need two of them to play against each other.
"You need Chelsea v Tottenham for one to lose points, you need Chelsea against Arsenal, us against City for somebody to lose points."