By Jude Summerfield The latest edition of a fierce Premier League rivalry turned out to be an easy night’s work for Liverpool as they crushed Manchester United 3-0 at Williams Brice Stadium in Columbia, South Carolina. It’s been a positive pre-season for new Reds boss Arne Slot as he maintained his unbeaten run over the summer friendlies, picking up a third win on the trot after successes against Real Betis and Arsenal. United, on the other hand, remain somewhat all over the place and could do with some of their Euro 2024 stars returning quickly after falling to a third pre-season defeat. As F…