The big-spending Spanish giants had countless efforts on goal but a mixture of good goalkeeping from Ajax goalie Maarten Stekelenburg, the woodwork and poor finishing saved Martin Jol's Ajax from a heavy defeat in their Group G opener.

It turned out easier for the English giants of Arsenal and Chelsea to find net before their less illustrious opponents.

Cesc Fabregas and Carlos Vela each scored twice in Arsenal's 6-0 rout of Portuguese side Braga, while Nicolas Anelka's double helped Chelsea surge to a 4-1 victory over newcomer Zilina.

Bayern Munich, beaten by Inter in the final in May, defeated AS Roma 2-0 in Group E. Thomas Muller and Miroslav Klose netted the goals towards the end of what was a frustrating night for Bayern, which spent the entire game trying to break down a catenaccio-inspired Serie A side and almost failed to do so.

Roma set its stall out to defend and, apart from two chances, it rarely threatened the Bayern goal. Enditem

Bayern Munich's Thomas Mueller (kneeling) celebrates with his team mates after scoring a goal against AS Roma during their Champions League Group E soccer match in Munich September 15, 2010.

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