Erling Haaland showcased his striking prowess by scoring twice as Manchester City opened their Champions League campaign with a 2-0 victory at Porto on September 20, 2023. The match was marked by a half-time tunnel bust-up following a clash between Marc Guehi and Gabri Veiga, which escalated tensions and required intervention from security personnel.

After a slow start, City finally broke the deadlock shortly after the interval. Haaland headed in the opener just two minutes into the second half, capitalizing on a cross from Enzo Fernandez. Despite this lead, Porto retaliated with several promising chances, including a header from Pepe that went wide and a close attempt from Alan Varela.

The match remained intense, with Porto pushing for an equalizer, yet it was Haaland who sealed the win in stoppage time, converting a cutback from Rayan Ait-Nouri. The game featured multiple confrontations, including a yellow card for Josko Gvardiol and a booking for Porto coach Francesco Farioli late in the match.

Ultimately, Manchester City emerged victorious, marking a successful start to their Champions League journey under manager Enzo Maresca.