Substitute Ferran Torres scored to give Barcelona a hard-fought 1-0 win at Porto in their Champions League Group H clash, with the Spanish side finishing with 10 men after Gavi got a second yellow card for a foul in added time.
Torres intercepted a pass by Porto midfielder Romario Baro and booted towards the box to score with a tidy finish during first-half injury time.
Barcelona held on against Porto's relentless pressure and goalkeeper Marc-Andre ter Stegen's heroics were crucial to help the visitors earn three valuable points away from home.
In the group's other game Toby Alderweireld missed a last-gasp penalty as Royal Antwerp threw away a two-goal lead to lose 3-2 at home to Shakhtar Donetsk.
The hosts were cruising as Arbnor Muja and Michel-Ange Balikwisha struck but Danylo Sikan scored either side of Yaroslav Rakitskiy levelling as Donetsk turned the match on its head.
Alderweireld had the opportunity to at least claim a point for Antwerp after Taras Stepanenko was adjudged to have handled in the area but the former Tottenham defender put his spot-kick wide.
AC Milan were frustrated by a disciplined Borussia Dortmund as their Group F fixture ended in a cagey 0-0 draw at Signal Iduna Park.
Milan's most productive spell came towards the end of the match but Samuel Chukwueze stumbled when presented with a clear chance, sending the ball straight to keeper Gregor Kobel, while Tijjani Reijnders put the rebound just wide.
Milan kicked off the match with a strong and high-paced performance, while Dortmund, who finished as Bundesliga runners-up last season, applied substantial pressure to disrupt the visitors' build-up and posed a constant threat on the counter-attack.
Dortmund came close several times, utilising the flanks and set-pieces to create opportunities, while Milan goalkeeper Mike Maignan made multiple saves to maintain the level score at halftime.
Alvaro Morata scored a brace to help Atletico Madrid fight back to secure a frantic 3-2 win over Feyenoord, with goalkeeper Jan Oblak putting in a superb second-half performance for the hosts.
Feyenoord were arguably the better side throughout the match and took an early lead thanks to an unfortunate own goal by defender Mario Hermoso, as Oblak's rebound from a Ayase Ueda effort in the sixth minute bounced off his knee and deflected into his own goal.
The hosts hit-back five minutes later with Morata's effort from inside the box.
However, the Dutch side were back in front in the 34th minute thanks to David Hancko strike from a rebound.
Atletico recovered with a close-range strike from Antoine Griezmann during the first half injury-time and Morata secured the win shortly after the restart by firing into the net.
Oblak's heroics kept frustrating Feyenoord and earned Atletico three valuable points.
Osman Bukari's strike two minutes from time helped Red Star Belgrade claim a point after a 2-2 draw against Young Boys.
