Champions League quarterfinal's first leg: Porto stuns Bayern, Barca thrashes PSG

Bayern Munich's coach Pep Guardiola reacts during their Champions League quarterfinal first leg soccer match against Porto at Dragao stadium in Porto April 15, 2015. [Photo/Agencies]

The visitors were grateful to Neuer for pulling off a stunning fingertip save early in the second half to prevent Boateng scoring an own goal, before Porto took a well-deserved and potentially decisive 3-1 lead.

Bayern's dismal defending cost them again when Boateng failed to deal with a high ball and Martinez stole in to round Neuer and sidefoot home.

An increasingly fraught second half was littered with yellow cards and bookings for Porto's first-choice full backs Danilo and Alex Sandro ruled them out of the second leg in Munich.