Marcus Rashford impressed for Manchester United on a night when their defence had a shocker in their unacceptable collapse against Porto in the Europa League.
Erik ten Hag made four changes for the trip to Portugal with Casemiro, Christian Eriksen, Amad Diallo and Rasmus Hojlund selected ahead of Kobbie Mainoo, Manuel Ugarte, Alejandro Garnacho and Joshua Zirkzee.
Porto started the match on top but it was United who took the lead when Rashford ran at goal from the left wing and squeezed a low effort beyond Diogo Costa.
They soon had a second when Rashford played through Rasmus Hojlund, who also fired an effort past Costa at the near-post, in what was a night to forget for the Porto goalkeeper.
It looked like United were well on course for a comfortable win, only for them to collapse in catastrophic circumstances in European competition under Ten Hag once again.
Pepe capitalised on poor defending from Lisandro Martinez to head his side back into the match and seven minutes later they had an equaliser when Samu Omorodion beat Matthijs de Ligt to a cross and headed into the back of the net.
Things then went from bad to worse when star performer Rashford was withdrawn at half-time to be replaced by Alejandro Garnacho and Samu struck shortly after the restart to give his side the lead for the first time in the match.
United looked lost for ideas as they tried to find a way back in the game but they rarely troubled the shaky Costa in an atrocious second-half performance. Any hopes of getting back into the match faded with ten minutes left when club captain Bruno Fernandes was sent off for a second yellow card following a high boot.
However, there was to be even more late drama when substitute Harry Maguire headed in from a corner to rescue a point for the 10-men and ease the immediate pressure on manager Ten Hag ahead of a trip to face Aston Villa in the Premier League this weekend.
Here is how we rated the United players in the match:
13. Antony - 4
He struggled to have a positive impact on the match and didn't improve the quality in the final third. | Manchester United via Getty Images Photo: Manchester United via Getty Images
14. Joshua Zirkzee - 4
Didn't offer anything different to Hojlund apart from less of a threat in front of goal. Never got into the game. | Manchester United via Getty Images Photo: Manchester United via Getty Images
15. Harry Maguire - 7
Inexplicably attempted to play a highline but saved the day with his heroic header at the death. A captain's performance on a night when their captain had a shocker. | AFP via Getty Images Photo: AFP via Getty Images
16. Jonny Evans - 5
It said so much that they even turned to him in the first place. | Manchester United via Getty Images Photo: Manchester United via Getty Images