Inter Milan were at their pragmatic best to beat Arsenal at the San Siro 1-0 to keep up their impressive form in the Champions League this season.
It was a first-half penalty from Hakan Calhanoglu that was the difference between the two sides in a game that saw the hosts resort to resolute defending for the better part of the second half with Arsenal throwing everything to get the three points.
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Despite the defeat, the Gunners will be impressed with the return to captain Martin Odegaard who came off the bench in the later stages of the game.
Elsewhere, Barcelona ran out 5-2 winners over Red Star, and RB Salzburg got their first win of the campaign with a 3-1 win over Feyenoord.
With practically the last kick of the game, Angel Correa tucked home a finish to give Atletico Madrid a 2-1 win over Paris Saint Germain in Paris.
The hosts took a 14th-minute lead through Zire Emery but Atleti equalized just four minutes later through Nahuel Molina. With the game headed for a draw, Correa was to pop up with the winner in the third minute of additional time.
In another game, Bayern huffed and puffed to a 1-0 win over Benfica. It was Jamal Musiala who proved to be the match-winner, netting in the 67th minute to earn the Bavarians just their second win in the Champions League this season.