Cristiano Ronaldo's first game for Juventus in his native Portugal ended in 2-1 defeat as FC Porto out-played the Italians for much of Wednesday's Champions League last-16, first leg tie, while Erling Braut Haaland starred in Borussia Dortmund's win over Sevilla.
Such was Juve's lacklustre performance that coach Andrea Pirlo claimed his team handed victory to their hosts on "a silver platter".
Iranian striker Mehdi Taremi put Porto ahead after just a minute at Estadio do Dragao following a Rodrigo Bentancur error.
And Mali striker Moussa Marega added a second straight after the break.
But Federico Chiesa pulled a goal back with eight minutes to go to keep Juventus afloat with the second leg in Turin on 9 March.
"The approach was wrong from the first minute," said Pirlo.
"When you concede a goal like this it's normal that fear sets in, you lack a bit of certainty.
"Porto are good at closing down and after that goal it was much more difficult. We served them the match they wanted on a silver platter.
"Fortunately we scored an important goal through Chiesa and now we will focus on the return leg."
It was a below-par performance by Juventus,chasing their third Champions League title and first in 25 years.
Record Champions League goal scorer Ronaldo, 36, drew a blank against a side captained by his Portuguese international teammate Pepe, as the visitors struggled to recover from their early blunder.
"We studied Juventus well," said defender Pepe who won three Champions League titles with Ronaldo at Real Madrid.
"We knew that we had to press hard to keep Juventus from playing. In these type of games it's difficult to concede goals at home, but we played a great game."
It was a shocking start for Juventus, with Wojciech Szczesny sending the ball out to Bentancur, who passed back to the Polish goalkeeper despite Taremi being just on front of goal.
The Iranian quickly pounced to prod past Szczesny for his first Champions League goal.
Porto pressed forward with Juventus almost conceding a second on 23 minutes as Szczesny cleared straight to Sergio Oliveira whose shot was deflected away from goal.
To add to Andrea Pirlo's woes captain Giorgio Chiellini limped off 10 minutes later with defender Merih Demiral coming off the bench.
Pirlo had juggled Juve's defence with Leonardo Bonucci out injured with Alex Sandro returning, playing alongside veteran Chiellini, Matthijs de Ligt and Danilo.
Juve had to wait until four minutes before the break for their first shot on goal with an Adrien Rabiot overhead kick cleared by Porto 'keeper Agustin Marchesin, but the offside flag had already been raised.
The Italians suffered another terrible start to the second half with Marega picking up a Wilson Manafa cross to finish low past Szczesny.
Ronaldo had to wait until five minutes after the break to have a shot on goal. Weston McKennie nodded the ball into the path of the Portuguese star, whose weak effort was blocked.
However, Chiesa pulled Juventus back into the tie following a Rabiot run down the right with a pull back for the Italian to finish off into the corner of the net.
"The goal will give us strength for the second leg, and it will certainly be another game," said Chiesa.
It was the first goal conceded by Porto in the competition at home this season for the former two-time winners.
Ronaldo had penalty appeals waved away after going down under a Sanusi Zaidu challenge late as the hosts held on for their first win over Juventus in five meetings.
Haaland stars as Dortmund beat Sevilla
Haaland produced another deadly display of finishing with a first-half brace as Dortmund came from behind to beat Sevilla 3-2 in Spain in the first leg of their Champions League last-16 tie.
Suso's deflected strike gave last season's Europa League winners an early lead behind closed doors at the Ramon Sanchez Pizjuan stadium, but Mahmoud Dahoud soon equalised before Haaland took over.
The Norway phenomenon put Dortmund in front in the 27th minute and then scored again two minutes before half-time, the goals taking him to 25 in 24 appearances this season in all competitions.
Still aged just 20, he has scored 18 times in just 13 Champions League appearances since the start of last season.
Substitute Luuk de Jong's late reply gave Sevilla cause for hope heading into the return leg on March 9, but Dortmund remain favourites to progress to the quarter-finals.
"We didn't deserve to lose, but in the end they had one of the best players in the world up front and he made the difference in three situations which could have been avoided," said Sevilla coach Julen Lopetegui.
Haaland, who also set up Dahoud's equaliser, produced a performance, in the first half at least, which showcased his remarkable strength, hold-up play and pace as well as his brilliant finishing.
Nine-game winning run ended
It was too much for a Sevilla side who had come into this tie with high hopes, having only been beaten by La Liga leaders Atletico Madrid, away, in their previous 19 outings.
Lopetegui's team had won their previous nine matches on the bounce and had kept seven straight clean sheets before the arrival of Dortmund and Haaland.
"This was one of our best performances of the season," Dortmund coach Edin Terzic, who replaced the sacked Lucien Favre after the group phase, told Sky.
"We are pleased with the result and proud to have beaten such a team."
Sevilla have won the Europa League or its predecessor, the UEFA Cup, an incredible six times since 2005, but only once have they got past the last 16 of the Champions League, when they beat Manchester United in 2018 before losing to Bayern Munich in the quarter-finals.
The quality of Haaland was the difference here as Dortmund, having sunk to sixth in the Bundesliga on a poor run of form, came to life on their return to the Champions League.
"We had a good plan. Edin has been good and I've been talking a lot with him. He said today would be my game and that I would get my chances and I did, so it was an important win," Haaland told DAZN.
Yet the game had started well for Sevilla, with Suso opening the scoring in the seventh minute, his shot deflecting in off Mats Hummels.
Dortmund drew level in the 19th minute as Haaland showed terrific strength to hold the ball up on the right before coming infield and feeding Dahoud, who worked his way into position to fire a superb shot high into net from just outside the area.
It was the first goal Sevilla had conceded in more than 12 hours of football.
Eight minutes later they conceded again.
Haaland dropped deep, collecting possession near the halfway line, and then turned and charged towards goal, playing a pass to Jadon Sancho on the edge of the box and then continuing on to place the return ball past goalkeeper Yassine Bounou.
He struck again two minutes before half-time, slotting home first-time after Marco Reus had stolen the ball from the feet of Alejandro 'Papu' Gomez before bearing down on goal.
However, Sevilla dominated the second half as Dortmund sat back, and the hosts got a potentially crucial second goal six minutes from the end.
Oscar Rodriguez's high, hanging free-kick was turned into the net by De Jong, giving them something to cling to.
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