Match Day 15 in the Bundesliga witnesses a clash of two of its giants when Dortmund travel to the Allianz Arena to face their title rivals Bayern while Schalke host Borussia MAi??nchengladbach in an attempt to get back their momentum. Midtable dwellers Mainz and Hannover face off while Leverkusen look to hold on to second place against Nurnberg. This and more in THTai??i??s Bundesliga preview.