Kerzhakov scored a second-half penalty as Zenit recorded its first win in the Champions League this season.
Portugal dominated possession but Alexander Kerzhakov's early goal decided the match on Friday
Alexander Kerzhakov scored early as Russia edged out Portugal 1-0 to earn their third consecutive win.
The Portuguese club is aiming to overturn a 3-2 deficit in the second leg of the round-of-16 series on Tuesday.
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