Jonathan Burkardt opened the scoring for Mainz after just three minutes with a smart finish.
Quaison pressured the defenders and eventually got his goal eight minutes before the half time whistle.
Robert Lewandowski netted for Bayern but it was too late as Mainz held on to the victory.
Quaison was adjudged man of the match for his solid performance.
Quaison has now netted four goals in 24 Bundesliga appearances this season.
He was born in Stockholm to a Ghanaian father and Swedish mom. Read Full Story
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