Chelsea put themselves in a commanding position at half-time in this tie by scoring two away goals without conceding.
Tuchel’s team were clinical throughout, holding Porto at arm’s length while notching themselves through Mount and Chilwell. They’re a threat in this competition, make no mistake.
Mason Mount who made the difference after 32 minutes. Chelsea held on from there before Chilwell gave them breathing space.
Yet it was Mount’s collection of the ball that transformed the moment. It wasn’t quite a Cruyff turn, but it was the next stage down.
Zaidu, Porto’s impressive left wing-back, ended up sprawled on the pitch, bamboozled as Mount sprinted towards goal.
He finished low across goalkeeper Agustin Marchesin, who should have done more. No matter. At 22 years and 87 days, Mount became Chelsea’s youngest goalscorer in a Champions League knockout game.
Porto had more chances without greatly threatening. They had an excuse, mind, striker Mehdi Taremi and his supplier Sergio Oliveira both missing through suspension.
As a pair they account for 40 per cent of Porto’s goals this season. They will be back next week, though, when there will also be no home advantage for Chelsea, both legs being played on neutral territory.
Expect more of the same from Tuchel’s men, then.
Porto have an uphill task in the second leg when it comes to budging past this Chelsea side.
Conceicao’s side created chances but none of them were good enough to really worry Mendy.
That’ll be something they think about as they reflect on this defeat.
Both teams return to domestic action then before meeting here in Seville again in six days’ time.
Chelsea will be confident of progressing now but Porto have already shown that they don’t give up that easily.