Louis van Gaal looks dejected after Manchester United's 2-1 defeat to Swansea
Gylfi Sigurdsson condemned United to their first defeat of the season in Van Gaal’s competitive debut as boss.
Sherlock Holmes and Moriarty. Professor X and Magneto. Rocky Balboa and Apollo Creed. Whether their feud is intellectual, ideological or played out in front of baying audience, cinema’s most iconic rivalries paint their opponents as two sides of the same coin; analogous adversaries that, despite a grudging respect and even admiration, share a dogged determination to outmanoeuvre each other at all costs.