The Norway international has made a prolific start to life as a Man City player, scoring a record-equalling 10 goals in his opening six Premier League games, including two hat-tricks.
Haaland had already shown his devastating goalscoring abilities on the Champions League stage too, and went into tonight's match with the best goals-per-game ratio of any player in the competition's history to have played at least 10 games.
That ratio was soon improved too, with the summer signing netting a trademark close-range finish from Kevin De Bruyne's cross after only 20 minutes at the Ramon Sanchez-Pizjuan Stadium.
Seven of Haaland's 11 goals for Man City have now come from inside the six-yard box, while his overall Champions League tally now stands at 24 goals in just 20 appearances, including five against Sevilla.
Tonight's goal also continues Haaland's record of scoring on his debut for clubs in the competition, having also done so for Red Bull Salzburg and Borussia Dortmund.
Monaco 
Stade Brestois 29 
Bordeaux 
Nimes 
Bayern Munich 
FC Augsburg 
Paris Saint Germain 
Toulouse 
CSKA Moscow 
FC Rostov 
Leicester 
Chelsea 
Valencia 
Betis 
Dynamo Kyiv 
Chornomorets Odesa 
Verona 
Inter 
Bayer Leverkusen 
FC Heidenheim 
Borussia Dortmund 
SC Freiburg 
VFL Wolfsburg 
Union Berlin 
Arsenal 
Nottingham Forest 
Everton 
Brentford 
Spartak Moscow 
Lokomotiv Moscow 
Rangers 
Dundee Utd 
Atletico Madrid 
Alaves 
Lens 
Marseille 
Ingulets Petrove 
Shakhtar Donetsk 
AC Milan 
Juventus 
ST Malo 
Manchester City 
Tottenham 
Eintracht Frankfurt 
Werder Bremen 
Girona 
Espanyol 
Feyenoord 
Heerenveen 
ST Etienne 
Montpellier 
Grenoble Foot 38 
Heart Of Midlothian 
Celtic 
Reims 
Lyon 
PSV 
Groningen