Benfica were caught while trying to play out from the back and then scored an own goal as Zenit claimed a 3-1 Champions League Group G win.
Zenit took advantage of sloppy defending to beat Benfica 3-1 and move into a strong position in Champions League Group G, with four points from their opening two games.
Sergei Semak's side built on their 1-1 draw at Lyon in the opening round with a confident performance at Saint Petersburg Stadium, where they had won four of their previous five matches in Europe's top competition.