Defender Alaba turned goal-scorer within the thirty second minute with a beautiful curling shot from the left facet of the realm that the outstretched Marc-Andre ter Stegen couldn’t cease.
His strike got here minutes after American Sergino Dest squandered Barcelona’s finest likelihood of the match when he despatched his close-range shot hovering over the crossbar.
Vazquez added a second objective in stoppage time on a counterattack with Barcelona desperately thrown ahead in the hunt for an equalizer.
Sergio Aguero pulled one again for Barcelona on a cross from Dest within the last seconds.
The victory moved Madrid to the highest of the Spanish league, stage on factors with Sevilla and Real Sociedad. Sociedad can reclaim the lead when it faces defending champion Atlético Madrid later Sunday.
The defeat was one other blow to Barcelona which has struggled since its monetary troubles stored it from re-signing Messi and different gamers. Ronald Koeman’s group was left in eighth place at 5 factors adrift.