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Manchester United beat Manchester City 2-0 on Sunday to complete a league double over their local rivals for the first time since 2009-10.
Goals from Anthony Martial and Scott McTominay handed the Red Devils all three points and means leaders Liverpool are now just two wins away from being crowned champions.
Sunday's only other Premier League fixture saw Chelsea tighten their grip on fourth place with a 4-0 win over Everton at Stamford Bridge.
Mason Mount and Pedro scored in the first half to put the Blues in control before Willian and Olivier Giroud found the net after half-time to secure all three points.