Borussia hit heights with 4-2 win over Zenit
Zenit Saint Petersburg's Viktor Fayzulin (R) vies with Borussia Dortmund's Robert Lewandowski (C) at Petrovsky Stadium in Saint Petersburg, on February 25, 2014 - by Alex Gottschalk
Last year's runners-up were two goals to the good inside the first five minutes through Henrikh Mkhitaryan and Marco Reus.
Zenit pulled one back through Oleg Shatov after 58 minutes only for Borussia to produce another killer blow when Polish striker Robert Lewandowski struck in the 61st minute.
Zenit came back again when they were awarded a penalty for a foul by Lukasz Piszczek on Viktor Fayzulin and it was dispatched by Hulk.
But once more Borussia struck back quickly through Lewandowski in the 71st minute for a two-goal cushion for the second leg in Germany.