It was a disappointing night for Barca, whose fans turned out in a near-sold-out stadium to see their new team starring Poland forward Lewandowski, the two-time FIFA World Player of the Year and Brazilian winger Rafinha. Barcelona dominated the match with almost 70% possession and 18 goal attempts to Rayo’s two. But the two best chances fell to the visitors, Álvaro García was saved by a superb Marc Andre ter Stegen save and Sergio Camello shot wide. As the frustration set in for Barca, captain Sergio Busquets lost his temper and elbowed Radamel Falcao in the face in stoppage time. In Italy, champions AC Milan turned an early one-goal deficit into a 4-2 win over Udinese at the San Siro, securing a winning start to their campaign in a thrilling Serie A opener. Two goals from Croatia international Ade Rebic plus strikes from Theo Hernandez and Brahim Diaz helped the Rossoneri recover from their early shock after Udinese defender Rodrigo Becao put the visitors ahead 90 seconds into the game. The Brazilian defender, who nodded in a corner from a tight angle, scored for the fifth time in Serie A at the start of his third season in Italy. “What didn’t we like? Certainly the fact that we conceded a goal in such a short period of time, we have to start the games better,” said Milan coach Stefano Pioli. “Then we played half an hour of great football.” Milan equalized in the 11th minute through Hernandez’s penalty after the referee pointed to the spot following a VAR review when captain Davide Calabria was fouled by Udinese defender Brandon Sopi. Four minutes later Rebic made it 2-1 with a powerful first-time strike, but Udinese defender Adam Masina equalized with a diving header to stun the hosts just before half-time. A minute into the second half, midfielder Díaz put Milan back in front after a mistake by the Udinese defence. Díaz got onto the ball from close range after Hernandez sent a cross into the box and it bounced off Masina. The goal sparked Udinese, but Rebic smashed another shot past goalkeeper Marco Silvestri into the top-left corner in the 68th minute to give the home side a breather and equal his tally of two goals all last season. Start your evenings with the Guardian’s view of the world of football Privacy Notice: Newsletters may contain information about charities, online advertising and content sponsored by external parties. For more information, see our Privacy Policy. We use Google reCaptcha to protect our website and Google’s Privacy Policy and Terms of Service apply. Neymar scored twice as Paris Saint-Germain beat Montpellier 5-2 in Ligue 1 at the Parc des Princes, while 10-man Monaco had to settle for a point at home to Rennes. Kylian Mbappé and debutant Renato Sanches were also on target for PSG, who were thwarted by an own goal from Montpellier defender Fallaye Sacko as the hosts made it two wins from two at the start of their title defence. Paris Saint-Germain players celebrate with Kylian Mbappe (left) after scoring their fourth goal against Montpellier. Photo: Emmanuel Dunand/AFP/Getty Images Mbappé had a penalty saved by a diving Jonas Omlin in the Montpellier goal after Jordan Ferri’s handball midway through the first half, but it proved a temporary reprieve for the visitors. Sakho conceded another penalty after handling the ball in the box. Neymar boosted PSG and made no mistake with the spot-kick to give his side a 2-0 half-time lead. Neymar added a second just after the break, returning a rebound. Montpellier were given hope when Khazri pulled a goal back just before the hour, but when Mbappé finally got on the scoresheet 10 minutes later, that was the end of the game. PSG extended their lead through Sanches on his debut following his move from Lille. Enzo Tchato pulled another goal back for Montpellier with essentially the last kick of the game, but it was a comfortable win for the home side. Earlier, Monaco came from behind to claim a point in a 1-1 home draw with Rennes, a match in which they were reduced to 10 men early on and missed a penalty. Youssouf Fofana received a straight red card inside 15 minutes for a stamp on Rennes’ Martin Terrier. Monaco won a first-half spot-kick which Axel Dassy missed as Rennes goalkeeper Steve Mandada made the save. Gaetan Laborde opened the scoring for Rennes early in the second period, but a disastrous mistake from substitute goalkeeper Dogan Alemdar, with Mandada at half-time, who held the ball out to allow Briel Embolo to dislodge him and score the opener of Monaco. goal, meant that the points were split.