European heavyweights Real Madrid and Manchester City both suffered big defeats in the Champions League on Tuesday. Defending champion Madrid was humbled 3-1 at home by AC Milan, while Erling Haaland missed a penalty and City squandered a fourth-minute lead as it lost 4-1 at Sporting Lisbon,

Tuesday will be remembered mostly as a day of upsets in the UEFA Champions League as Real Madrid and Manchester City — Europe's two most recent title holders — both suffered lopsided defeats.

Follow along with all the Champions League matchday action on Nov. 5 with SI Soccer chronicling the moments from Real Madrid vs. AC Milan, Liverpool vs. Leverkusen, Manchester City in action and more live.

Matchday four of Champions League play got off to a wild start with Sporting Club Portugal securing an upset victory over Manchester City. Erling Haaland missed a penalty and Viktor Gyokeres scored a hat trick as Ruben Amorim preps for taking over Manchester United during the November international break.

Goals from Malick Thiaw, Alvaro Morata and Tijjani Reijnders led the visitors past the Champions League holders

Malick Thiaw, Alvaro Morata and Tijjani Reijnders silenced the home fans at the Santiago Bernabeu as they led AC Milan to a 3-1 win against Real Madrid, while Erling Haaland missed a penalty as Manchestet City were stunned 4-1 at Sporting.