Bayern coach Louis van Gaal thinks Mainz could win the Bundesliga title
"We had a lot of trouble with the playing style of Mainz and committed many errors," he said according to Kicker. "The problem is that too many players underperformed.
"Nevertheless, we had chances, but overall, we played poorly. This is because of Mainz."
Mainz went ahead early through Sami Allagui, and although Bayern equalised late in the first half, it required a calamitous mistake and an own goal to do so. The visitors took three points late on as Adam Szalai fired in an emphatic winner.
Van Gaal then called for improvement from his side while claiming that Mainz could indeed win the Bundesliga title, citing Kaiserslautern's surprise triumph more than a decade ago.
"We must get out of this situation. That won't be easy. I am confident that Mainz can become champions. Kaiserslautern did it once, why not Mainz?"