By Tom Gott Manchester United ended their season on a high with a huge victory over Manchester City in the FA Cup final at Wembley. Alejandro Garnacho and Kobbie Mainoo netted in the first half to steer United to a famous 2-1 victory, sealing a spot in the Europa League for the Red Devils after a disappointing campaign threatened to end in disaster. Here are United’s top performers from the game according to 90min’s player ratings. Man Utd’s best player vs Man CityKobbie Mainoo – 9/10This kid is not human. The 19-year-old flashed his typical composure to fire United into a two-goal lead in the…