Hulk missed a penalty but scored the leveller as Zenit St Petersburg secured a 1-1 home draw against Porto on Wednesday to stay favourites for the runners-up spot in Champions League Group G.
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The Brazilian dented his former club's hopes as Zenit moved onto five points with two matches remaining, one above the Portuguese champions, who are third.
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Porto captain Lucho Gonzalez opened the scoring with a fine header after 23 minutes before burly forward Hulk soon punished some lax defending to level.
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Helton saved a Hulk penalty in the second period, awarded for a Nicolas Otamendi handball.
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Leaders Atletico Madrid host bottom side Austria Vienna later.