Kai Havertz and Bukayo Saka helped Arsenal defeat PSG 2:0 on Tuesday as the Gunners secured their first win in the Champions League this season.
The Gunners had played a goalless draw with Atalanta on Match Day 1.
But back at the Emirates, goals from Kai Havertz and Bukayo Saka gave the hosts a crucial victory.
On the other side, Manchester City also recorded their first win, with a commanding 4-0 win at Slovan Bratislava.
Dortmund humiliated Celtic 7-1 and Brest won 4-0 at RB Salzburg.
While, Barcelona thrashed Young Boys 5-0 and Inter Milan claimed a 4-0 home win over Red Star Belgrade.
