Arsenal won 2-0 away to Athletic Bilbao as the league phase of this season's Champions League kicked off on Tuesday, with two Kylian Mbappe penalties giving Real Madrid a narrow win over Marseille, while Juventus and Borussia Dortmund drew in an eight-goal thriller.

Tottenham Hotspur also won on the tournament's opening night, which saw outsiders Union Saint-Gilloise and Qarabag claim first-ever victories in the Champions League proper.

Arsenal is eager to make a big impression again in Europe's elite club competition, following its defeat by eventual champion Paris Saint-Germain in the semifinals last season.