Bayern Munich came looking for a title party and were served with a cold dose of reality as survival scrappers Mainz earned a stunning 2-1 win over the Bundesliga leaders.

First-half goals from Jonathan Burkardt and Robin Quaison put in-form Mainz in charge, and a leggy Bayern side - who would have been crowned champions with a victory - lacked the zip in their game to overturn that deficit.

Manuel Neuer was at fault for the opener, but also produced some big saves to keep Bayern in touch with their impressive hosts, who have been the most-improved team in the league in the second half of the season.

When Quaison headed the second, he showed the aerial threat that was rarely seen from Bayern's fit-again talisman Robert Lewandowski in this game. Lewandowski snatched a last-gasp consolation after a defensive clanger, but it came too late to be significant.

Burkardt stunned Bayern in the third minute when he was left unattended on the edge of the penalty area and fired a thumping shot that Neuer could only help into the left corner.