Porto scored in the first minute of each half to edge ahead in their Champions League tie against Juventus.
Mehdi Taremi pounced on Rodrigo Bentancur’s poor back pass to slide in and convert after only 63 seconds.
Juventus were being outplayed but Adrien Rabiot saw an acrobatic effort pushed away, and Moussa Marega stroked home 19 seconds into the second half.
But Federico Chiesa pulled a goal back on 82 minutes heading into the return leg of the last-16 tie on 9 March.