Bundesliga: Mainz Stun Bayern Munich To Delay Title Party

Bayern Munich blew the chance to clinch the Bundesliga title for a ninth successive season on Saturday as the club world champions crashed to a 2-1 defeat away to Mainz.

First-half goals by Jonathan Burkardt and Robin Quaison sealed Mainz's third straight win, pulling them away from the relegation fight and forcing Bayern to wait to be crowned champions.

On his return from a knee injury, Bayern striker Robert Lewandowski scored just before the end to leave him four short of Gerd Mueller's all-time record of 40 Bundesliga goals in a season.

"We just have to put the game behind us, we just weren't asserive enough," said Bayern coach Hansi Flick who wants to leave at the end of the season.

Bayern can still win the title on Sunday without kicking a ball if second-placed RB Leipzig, who are 10 points behind Munich, lose at home to Stuttgart.

"That was too little from us in the first half, you can't win games like that, in terms of body language and our build up," said Bayern captain Manuel Neuer, who was at fault for the opening goal.

"We created too few chances and were punished for our own mistakes."

Mainz made sure Bayern had to put the champagne back on ice by capitalising on the visitors' errors.

With just three minutes gone, a speculative shot by Germany Under-21 striker Burkardt from the edge of the area deceived Neuer and flew into the Bayern net.

The hosts doubled their lead before the break when Swedish striker Quaison got in between David Alaba and Thomas Mueller to power his header past Neuer.

Bayern showed an unusual lack of discipline as Jerome Boateng, Leon Goretzka and Alaba were all shown yellow cards within six minutes late in the first half.

Mainz had also been 2-0 up at halftime against Bayern at the Allianz Arena in January until the hosts roared back to win 5-2 when Lewandowski scored twice.

However, this time Mainz held their nerve to earn their first home win over Bayern for nearly a decade.

Lewandowski's goal four minutes into added time was the visitors' only consolation. (AFP)