Defending champions Bayern Munich demolished arch-rivals Borussia Dortmund 4-0 on Saturday, with two goals from top scorer Robert Lewandowski jumping up to the third place and giving interim coach Hansi Flick an impressive Bundesliga debut.\r\n\r\nLewandowski kept up his sensational netting run, scoring in the 17th and 76th minutes increasing his score sheet to 16 goals. He has now scored in each of the 11 league games this season.\r\n\r\nSerge Gnabry also scored as was Dortmund defender Mats Hummels, who closed out a terrible performance= with an 80th-minute own goal.\r\n\r\nThe <a href="https:\/\/en.wikipedia.org\/wiki\/FC_Bayern_Munich">Bavarians<\/a> finally rebounded after a shocking 5-1 defeat to Eintracht Frankfurt that cost coach Niko Kovac his job, outclassing lacklustre Dortmund in every department, as their arch-rivals could only watch as they got dismantled.\r\n\r\nDortmund started the game strongly, but after 15 minutes Bayern gradually took control and Lewandowski put them in the lead.\r\n\r\nDortmund's backline appeared bedazzled. Dortmund coach Lucien Favre took Jadon Sancho off after only 36 minutes and replaced him with Raphael Guerreiro but to no avail.\r\n\r\nBayern struck again two minutes after the restart with Gnabry, who had put the ball in the net in the first half\u00a0 only to be ruled offside.\r\n\r\nDortmund created only one clear chance in the game through Paco Alcacer but was unable to score, while Lewandowski made it 3-0 from close range in the 76th and Hummels converted a Bayern attack into his own net four minutes later to compound his side's defeat.\r\n\r\nBayern moves up to 21 points, third on goal difference behind RB Leipzig, 4-2 winners at Hertha Berlin. Leaders Borussia Moenchengladbach hosts Werder Bremen on Sunday. Dortmund dropped to fifth on 19.