A skillful Mason Mount goal and a late Ben Chilwell strike  helped Chelsea to a 2-0 first-leg win on Wednesday over Porto, whose wasteful final third play may have dented any of their hopes of springing another Champions League upset in the quarter-finals.

Mount’s slick turn and shot in the first half would have been painful enough for Porto, who were the better side for large spells of this first leg in Seville but repeatedly lacked the precision to take advantage.

Their misery was compounded by a defensive howler, with Ben Chilwell capitalising to score a late second that gave Chelsea another away goal and a Champions League semi-final spot in sight.

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The away goals were just a formality though as both teams were playing in the unfamiliar Ramon Sanchez Pizjuan. They will play each other again next week at the same venue, just with the home and away roles reversed.

Porto were in the home dug-out, wore their home kit, had a large club banner in the empty stand behind one goal and their anthem was the one that played out before kick-off.

And Chelsea played the part too, delivering a classic away performance of soaking up the pressure and hitting their opponents on the counter-attack, their quality in the final third proving decisive.

Thomas Tuchel decided Thiago Silva’s 29 minutes before being sent off in a loss against West Brom last week were not enough to hone his sharpness, meaning Andreas Christensen was picked in the back three.

And Antonio Rudiger also returned, despite his training ground scuffle with Kepa Arrizabalaga on Sunday, which Tuchel described as a “serious situation”.

Porto were regarded as the plum draw in the last eight, despite seeing off Cristiano Ronaldo and Juventus in the last 16, their task made harder this time by the suspensions of Mehdi Taremi and top scorer Sergio Oliveira.

But they were the aggressors from the outset, with Chelsea surrendering the ball and the chances.

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Porto had six shots to Chelsea’s one before half-time, with Mateus Uribe grazing the top of the net with an early volley and the excellent Otavio almost catching Edouard Mendy out with a corner before Zaidu Sanusi smashed over the rebound.

Chelsea, though, showed them what ruthlessness looked like when Jorginho fired a pass into Mount on the edge of the area inside the right channel. Mount took it on his back foot and twisted away from the sliding Zaidu, before firing a cool finish into the far corner.

Porto kept coming in the second half and kept missing too. Moussa Marega snuck in but his shot was saved by the feet of Mendy before Jesus Corona feathered Luis Diaz through but he took too long. Diaz curled wide after a good run by Wilson Manafa.

Chelsea absorbed them and then hit them with a sucker-punch, Mateo Kovacic’s ball over the top miscontrolled by Corona, allowing Chilwell to steam clear, round the goalkeeper and finish.