Lisandro Martinez said it was a "dream" to score his first Manchester United goal, but the central defender was disappointed his side slumped to defeat at Arsenal.
Martinez made it 2-2 in the second half but Eddie Nketiah netted a last-minute winner to give the Gunners all three points and condemn United to a first defeat in 11 games.
Marcus Rashford had initially given United the lead before goals from Nketiah and Bukayo Saka. Martinez then stooped to head in a corner to level the scores in what was an entertaining and high-quality game.
