​Paris Saint-Germain’s Ousmane Dembele celebrates scoring his side’s first goal during the UEFA Champions League group stage soccer match between Paris Saint-Germain and SK Slovan Bratislava at Parc des Princes Stadium. (is associated with: «Holders PSG and Barca turn on the style with big Champions League wins») Matthieu Mirville/ZUMA Press Wire/dpaParis Saint-Germain shook off their domestic woes as they started the quest for a third straight Champions League with an emphatic 6-1 triumph over Slovan Bratislava while Barcelona continued their flying start into the season by trouncing Feyenoord 5-1 on Wednesday.Ferran Torres had a hat-trick and Ousmane Dembelé scored a brace and added a pair of assists for PSG who are yet to win a season game in France.Raphinha also had two goals for Barcelona, with young star Lamine Yamal on target as well as two of the top title contenders made early statements.Atlético Madrid’s Marcos Llorente scored a fifth personal goal at Anfield but hosts Liverpool fought back to win 2-1 from Dominik Szoboszlai and Alexis Mac Allister. Last season’s runners-up Arsenal prevailed 1-0 at Napoli from Martin Ødegaard.Elsewhere, Ermedin Demirović scored a hat-trick within a span of 13 first-half minutes in VfB Stuttgart’s 3-1 win against debutants Viking Stavanger and Sporting also recorded a 3-1 success against Galatasaray.The first matchday spread over three days ends on Thursday with six games, including six-time winners Bayern Munich v last year’s surprise team Bodø/Glimt and ex-champions Manchester United v newcomers Sabah of Azerbaijan.Atletico Madrid’s Marcos Llorente (2nd L) scores his side’s first goal during the UEFA Champions League group stage soccer match between Liverpool and Atletico Madrid at Anfield. (is associated with: «Holders PSG and Barca turn on the style with big Champions League wins») Peter Byrne/PA Wire/dpaArsenal’s Viktor Gyokeres (L) and Napoli’s Amir Rrahmani battle for the ball during the UEFA Champions League group stage soccer match between SSC Napoli and Arsenal at the Stadio Diego Armando Maradona. (is associated with: «Holders PSG and Barca turn on the style with big Champions League wins») Agostino Gemito/PA Wire/dpaStuttgart’s Ermedin Demirovic scores his side’s third goal during the UEFA Champions League soccer match between VfB Stuttgart and Viking Stavanger at MHP Arena. (is associated with: «Holders PSG and Barca turn on the style with big Champions League wins») Harry Langer/dpa