Mainz and Hannover played out a 0-0 draw at the Coface Arena on Sunday afternoon.
Bayer Leverkusen claimed a shock 2-0 Bundesliga win at Borussia Dortmund on Saturday, while Hannover beat Schalke.
Hannover came from behind to beat Schalke 2-1 and increase the pressure on the Royal Blues' coach Jens Keller.
Hannover admit to being in the market for a new midfielder but deny that Chelsea's Marko Marin is a target.
Hannover have strengthened their squad ahead of the new season by signing Austria international goalkeeper Robert Almer.
Hannover have announced the signing of Japan international midfielder Hiroshi Kiyotake from relegated Nurnberg.
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