Manchester: Goals by Lionel Messi and Dani Alves saw Barcelona take control of their Champions League last 16 tie against Manchester City with a 2-0 win in Tuesday's first leg.

Knockout-phase debutants City matched Barcelona in the first half at the Etihad Stadium, but the game changed early in the second period when Martin Demichelis was sent off following a last-man foul on Messi.