Dortmund knows that a victory over a mid-table opponent will keep them at the top of the standings.
With a victory at Cologne, Mainz will win the Bundesliga for the first time since 2012, while Bayern can win the league for the 11th consecutive season, but only if the leaders falter.
With their title-deciding match against Mainz on the tense final day of the Bundesliga on Saturday, Borussia Dortmund is poised to end Bayern Munich's ten-year hold on the German championship.
The title was already in Bayern's grasp in previous campaigns, but this time, their gaffes and Dortmund's tenacity are keeping the tension high until the final whistle.
In addition to one of the most competitive relegation battles in recent memory, European spots are also at stake.
Dortmund knows that a victory over Mainz in the middle of the standings will guarantee them their first Bundesliga title since 2012, while Bayern can win their 11th straight Bundesliga championship with a victory at Cologne—but only if the leaders falter.