Barcelona have reached three Women's Champions League finals in the past four years
Teenager Salma Paralluelo gave Barcelona victory over Women's Champions League debutants Roma in the first leg of their quarter-final.
Paralluelo's curling strike gave Barca a narrow first-half lead in front of a crowd of 39,454 - the largest for a women's game in Italy.
But last year's finalists were given a scare at Stadio Olimpico.
Several missed chances by Barcelona almost proved costly as Roma threatened heavily late on.
Barcelona's Asisat Oshoala, Aitana Bonmati and Caroline Graham Hansen were all denied, while further chances were spurned by the 2021 champions, particularly after the break.
The Spanish giants, who have reached three finals in the past four years, were frustrated by Roma goalkeeper Camelia Ceasar's inspired display.
Ceasar made several crucial saves to block Oshoala in the second half, having kept out Graham Hansen and Bonmati before the break, and Oshoala's header was also cleared off the line by defender Elena Linari.
Roma, who were given a standing ovation by home fans at half-time for their efforts, had a flurry of chances in the second half and grew into the game.
Valentina Giacinti's shot was deflected inches over the bar by Maria Leon before the Italians showed a glimpse of their threat on the counter-attack when Emilie Haavi later forced a smart save from Barcelona's Sandra Panos.
Andressa Alves struck wide and Manuela Giugliano had a powerful effort tipped over the bar with less than 10 minutes remaining, before Giacinti almost equalised in the final minute from a smart free-kick routine.
Roma are seeking to reach the semi-finals in their first European campaign and will travel to Nou Camp for the second leg on Wednesday, 29 March after Barcelona face Real Madrid in Saturday's El Classico.
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- Line-upsMatch StatsLive Text
Line-upsRoma Femminile
Formation 4-4-2
12Ceasar13Bartoli23Wenninger32Linari2Minami15Serturini20Greggi10Giugliano7Alves da Silva9Giacinti11Haavi
- 12Ceasar13BartoliSubstituted forDi Guglielmoat 66'minutes23Wenninger32Linari2Minami15SerturiniSubstituted forGlionnaat 61'minutes20GreggiSubstituted forLosadaat 61'minutes10Giugliano7Alves da Silva9GiacintiBooked at 34mins11Haavi
Substitutes
- 3Di Guglielmo5Cinotti6Landström14Losada16Ciccotti18Glionna19Selerud27Kollmats28Petrara52Merolla53Bruni87Ãhrström
Barcelona Femenino
Formation 4-3-3
1Paños15Bronze2Paredes4León Cebrián16Rolfö14BonmatÃ21Walsh12Guijarro Gutiérrez10Hansen20Oshoala17Paralluelo
- 1Paños15BronzeBooked at 81minsSubstituted forTorrejónat 90+2'minutes2ParedesBooked at 37mins4León Cebrián16Rolfö14BonmatÃ21Walsh12Guijarro GutiérrezSubstituted forEngenat 79'minutes10HansenSubstituted forVilamalaat 90+2'minutes20OshoalaSubstituted forda Silva Ferreiraat 66'minutes17ParallueloSubstituted forCrnogorcevicat 78'minutes
Substitutes
- 3Codina5Fernández Velasco7Crnogorcevic8Torrejón13Coll Lluch18da Silva Ferreira19Vilamala22Rábano23Engen24Font Oliveras25RamÃrez30López Serrano
Referee:Iuliana Elena DemetrescuMatch StatsHome TeamRoma FemminileAway TeamBarcelona FemeninoPossessionHome31%Away69%ShotsHome10Away33Shots on TargetHome4Away11CornersHome4Away10FoulsHome5Away11Live Text Post update
Match ends, Roma Femminile 0, Barcelona Femenino 1.
90'+5'Full Time
Second Half ends, Roma Femminile 0, Barcelona Femenino 1.
90'+4'Post update
Foul by Bruna Vilamala (Barcelona Femenino).
90'+4'Post update
Moeka Minami (Roma Femminile) wins a free kick in the defensive half.
90'+4'Post update
Attempt blocked. Carina Wenninger (Roma Femminile) right footed shot from the centre of the box is blocked. Assisted by Manuela Giugliano with a cross.
90'+3'Post update
Corner, Roma Femminile. Conceded by Sandra Paños.
90'+3'Post update
Attempt saved. Valentina Giacinti (Roma Femminile) right footed shot from the right side of the box is saved in the bottom right corner. Assisted by Manuela Giugliano.
90'+3'Post update
Delay over. They are ready to continue.
90'+3'Post update
Delay in match because of an injury Andressa Alves (Roma Femminile).
90'+2'Post update
Foul by Fridolina Rolfö (Barcelona Femenino).
90'+2'Post update
Andressa Alves (Roma Femminile) wins a free kick on the right wing.
90'+2'Substitution
Substitution, Barcelona Femenino. Marta Torrejón replaces Lucy Bronze.
90'+2'Substitution
Substitution, Barcelona Femenino. Bruna Vilamala replaces Caroline Hansen.
89'Post update
Foul by Ana-Maria Crnogorcevic (Barcelona Femenino).
89'Post update
Lucia Di Guglielmo (Roma Femminile) wins a free kick on the right wing.
88'Post update
Foul by Mapi León (Barcelona Femenino).
88'Post update
Andressa Alves (Roma Femminile) wins a free kick in the defensive half.
88'Post update
Attempt missed. Geyse Ferreira (Barcelona Femenino) header from the centre of the box misses to the right. Assisted by Caroline Hansen with a cross.
85'Post update
Caroline Hansen (Barcelona Femenino) wins a free kick in the defensive half.
85'Post update
Foul by Manuela Giugliano (Roma Femminile).
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Source: bbc.com