Barcelona, who also won the competition in 2021, beat Wolfsburg 3-2 in in June's final
Barcelona continued their perfect start to the defence of their Women's Champions League title with a dominant win over Sweden's Rosengard.
Jessica Wik's own-goal gave Barca a 16th-minute lead before Salma Paralluelo doubled their advantage.
Patricia Guijarro scored from long range and Ballon d'Or winner Aitana Bonmati tapped in a fourth.
Mariona Caldentey converted a penalty before 19-year-old Martina Fernandez scored their sixth in injury time.
Barcelona controlled the game and limited their opponents to just 24% possession and one shot on target.
England full-back Lucy Bronze and former Manchester United defender Ona Batlle regularly made overlapping runs to carve out chances for the visitors.
Barca have won their opening three group stage games and top Group A with nine points.
Rosengard are still waiting for their first points and sit bottom of the group.
- Line-upsMatch StatsLive Text
Line-upsRosengård Women
Formation 4-3-3
12Mukasa7Brown2Obaze3Arnardóttir15Wik19Bredgaard11Jansson6Öling9Larsson22Schough24Andersson
- 12Mukasa7Brown2Obaze3Arnardóttir15Wik19BredgaardSubstituted forSprungat 74'minutes11JanssonBooked at 32minsSubstituted forLundgrenat 83'minutes6Öling9Larsson22SchoughSubstituted forStojanovskaat 90+2'minutes24Andersson
Substitutes
- 4Ayinde8Knaak20Persson25Berglund36Lundgren40Sprung46Stojanovska48Hellwig50Lynn
Barcelona Femenino
Formation 4-3-3
1Paños15Bronze8Torrejón23Engen22Batlle14Bonmatí21Walsh12Guijarro Gutiérrez24Brugts7Paralluelo9Caldentey Oliver
- 1Paños15Bronze8Torrejón23EngenSubstituted forFernándezat 66'minutes22Batlle14BonmatíSubstituted forLópez Serrano Félixat 65'minutes21Walsh12Guijarro GutiérrezSubstituted forBartelat 78'minutes24BrugtsSubstituted forDragoniat 78'minutes7ParallueloSubstituted forPinaat 65'minutes9Caldentey Oliver
Substitutes
- 6Pina10Graham Hansen20Oshoala25Font26Dragoni30López Serrano Félix32Arias34Fernández39Bartel
Referee:Monika MularczykMatch StatsHome TeamRosengård WomenAway TeamBarcelona FemeninoPossessionHome25%Away75%ShotsHome6Away19Shots on TargetHome1Away10CornersHome1Away11FoulsHome4Away4Live Text Post update
Match ends, Rosengård Women 0, Barcelona Femenino 6.
90'+3'Full Time
Second Half ends, Rosengård Women 0, Barcelona Femenino 6.
90'+3'Post update
Attempt missed. Gudrún Arnardóttir (Rosengård Women) header from the centre of the box is high and wide to the left. Assisted by Fiona Brown with a cross following a corner.
90'+3'Post update
Corner, Rosengård Women. Conceded by Marta Torrejón.
90'+2'Substitution
Substitution, Rosengård Women. Mikaela Stojanovska replaces Olivia Schough.
90'+2'goalGoal!
Goal! Rosengård Women 0, Barcelona Femenino 6. Martina Fernández (Barcelona Femenino) right footed shot from the centre of the box to the centre of the goal. Assisted by Clàudia Pina with a cross following a corner.
90'+1'Post update
Corner, Barcelona Femenino. Conceded by Jessica Wik.
89'Post update
Attempt missed. Ria Öling (Rosengård Women) right footed shot from the left side of the box is high and wide to the right. Assisted by Athinna Lundgren.
88'Post update
Corner, Barcelona Femenino. Conceded by Fiona Brown.
88'Post update
Corner, Barcelona Femenino. Conceded by Fiona Brown.
86'Post update
Attempt blocked. Athinna Lundgren (Rosengård Women) left footed shot from outside the box is blocked.
86'Post update
Attempt blocked. Jessica Wik (Rosengård Women) header from the centre of the box is blocked. Assisted by Fiona Brown with a cross.
84'Post update
Corner, Barcelona Femenino. Conceded by Fiona Brown.
83'Substitution
Substitution, Rosengård Women. Athinna Lundgren replaces Emma Jansson.
83'Post update
Offside, Barcelona Femenino. Vicky López is caught offside.
81'Post update
Foul by Giulia Dragoni (Barcelona Femenino).
81'Post update
Olivia Schough (Rosengård Women) wins a free kick in the defensive half.
80'Post update
Attempt missed. Clàudia Pina (Barcelona Femenino) right footed shot from outside the box is too high.
78'Substitution
Substitution, Barcelona Femenino. Júlia Bartel replaces Patri Guijarro.
78'Substitution
Substitution, Barcelona Femenino. Giulia Dragoni replaces Esmee Brugts.
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Source: bbc.com