Their fourth straight win in the German top division lifted Schalke to 46 points on Friday, four ahead of third-place Borussia Dortmund, who will host fourth-place Eintracht Frankfurt on Sunday, repors EFE news agency.
Mainz, meanwhile, extended their winless streak to four and hold the 16th spot.
The lone goal of the contest came in the 56th minute as the result of a great individual effort by Schalke's Daniel Caligiuri, who beat three defenders before putting the ball past keeper Florian Muller.
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