Mainz sacked Sandro Schwarz as head coach on Sunday after more than two years in charge, making him the third boss to be dismissed by a Bundesliga club in the last week.
Schwarz, 41, was shown the door after Saturday's 3-2 home defeat to newly-promoted Union Berlin which followed last week's 8-0 drubbing at high-flier RB Leipzig.
Schwarz's dismissal comes after Achim Beierlorzer was sacked by Cologne on Saturday, and Niko Kovac was let go by Bayern Munich last weekend.
Defeat to Union saw Mainz drop into the bottom three after losing eight of its first 11 league games this season - the worst start to a season in the club's history.
Mainz now has a fortnight to find a new coach during the international break before its next game on November 24 at Hoffenheim, which is fourth after winning all of its last six games.
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