Barcelona's Lionel Messi (C) scores his second goal against Spartak Moscow as Dmitri Kombarov (R) and goalkeeper Andriy Dykan try to stop him at the Nou Camp Stadium in Barcelona Wednesday. — Reuters LONDON — Chelsea found a new Champions League hero as Brazilian Oscar scored twice for the holder in a 2-2 draw against Juventus and Barcelona had yet another commanding performance from Lionel Messi to thank for a 3-2 win over Spartak Moscow Wednesday. Bayern Munich banished some demons in its first European fixture since its bitter final defeat by Chelsea in May with victory over Valencia and Manchester United, with plenty to prove after last season's woes, also began with three points. Oscar's first taste of Champions League football since joining from Internacional will linger long after he fired the London club into a 2-0 lead, the second of his goals a rare gem, but Juventus ruined his script, hitting back to earn a point in the Group E opener through Arturo Vidal and Fabio Quagliarella. Barcelona was heading for its first Champions League defeat at the Nou Camp for 17 matches when a Dani Alves own goal and Romulo's 59th-minute effort put Spartak 2-1 ahead in the Group G game but Messi restored order with his 52nd and 53rd goals in the competition. Manchester United began Group H with an unconvincing 1-0 victory over Galatasaray. The hosts failed to build on Michael Carrick's early goal and Nani's 53rd-minute penalty miss added to the nerves. Bayern enjoyed a 2-1 victory over visiting Valencia in Group F with Bastian Schweinsteiger and Toni Kroos on target for the Bundesliga club. Two of the Champions League's makeweights, BATE Borisov and CFR Cluj, enjoyed encouraging starts. BATE, the champion of Belarus, earned a first ever group stage win when it beat French side Lille 3-1 away in Group F. Romanians Cluj impressed in a 2-0 victory at Portuguese side Braga with Rafael Bastos returning to score twice before halftime against his former club. Scottish side Celtic drew 0-0 at home to Benfica on their return to the group phase for the first time since 2008. Danish newcomers Nordsjaelland got a taste of the challenges to come when they were beaten 2-0 by Ukraine's Shakhtar Donetsk. Didier Drogba is no longer in their ranks but the Stamford Bridge faithful roared their approval as Oscar grabbed center stage. The Brazilian's deflected shot beat Gianluigi Buffon after 31 minutes and while there was an element of luck about that effort, his second two minutes later was a moment of magic. Turning sharply into space on the edge of the area, he curled an audacious shot into Buffon's top corner. Despite Oscar's electrifying first start for Chelsea since his 25 million-pound move, Juventus showed its resilience and returned with a deserved share of the spoils. Vidal's low shot halved the deficit after 38 minutes and Claudio Marchisio's precise pass allowed Quagliarella to slip a shot under Petr Cech with 10 minutes remaining. — Reuters