The Champions League served up some dramatic surprises this week as two European titans, Real Madrid and Manchester City, were humbled on Tuesday.Real Madrid, last year's champions, took a beating on home turf with a 3-1 loss to AC Milan. Meanwhile, Erling Haaland missed a crucial penalty as Manchester City, after initially securing a lead four minutes in, crumbled to a 4-1 defeat against Sporting Lisbon. Adding an interesting twist, Lisbon's coach is set to switch allegiance to City’s neighbors soon.Liverpool, on the other…