Sunday's results leave United in pole position to retain their title with seven games of the season to go but the main talking point after this match was Mascherano's dismissal.
The Argentine midfielder, who had been booked early on for a wild challenge on Paul Scholes, foolishly chose to continue an argument that his team-mate Fernando Torres had started with referee Steve Bennett over a series of challenges by United players.
In a week dominated by discussion of Ashley Cole's conduct towards the officials during Chelsea's draw with Tottenham on Wednesday, the spotlight was always going to be on how Bennett reacted here.
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