Thomson ReutersFebruary 9, 2013 13:45
* Bayern go 15 points clear at the top
* Left back Alaba scores twice
* Dortmund lose, Leverkusen draw (Writes through, adds quotes)
By Karolos Grohmann
BERLIN, Feb 9 (Reuters) - Bayern Munich demolished Schalke 04 4-0 with two goals from David Alaba to open a 15-point gap at the top of the Bundesliga on Saturday as champions Borussia Dortmund and Bayer Leverkusen slipped up.