Schalke defeated Borussia Dortmund 2-1 in the 167th Ruhr derby and Bayern Munich tightened its grip on top place in the Bundesliga with a 2-0 win at Cologne on Saturday. Schalke defender Joel Matip scored with an easy header in the 10th and Eric Maxim Choupo-Moting made it 2-0 in the 23rd after more lax Dortmund defending. Pierre-Emerick Aubameyang answered three minutes later, but couldn't prevent the visitors from slipping seven points behind Bayern after just six games. Mario Goetze got Bayern off the mark in the 19th, and forced an own goal from Daniel Halfar in the 67th. Elsewhere, Stuttgart defeated Hannover 1-0 for its first win of the season, Bayer Leverkusen drew at Freiburg 0-0, and Borussia Moenchengladbach won at Paderborn 2-1. Wolfsburg hosted Werder Bremen later. (For more sports news and updates, follow AhramOnline Sports on Twitter at@AO_Sportsand on Facebook atAhramOnlineSports.) http://english.ahram.org.eg/News/111817.aspx