Bayern Munich went four points clear in the Bundesliga with a 4-0 romp against Hannover while Schalke, Borussia Dortmund and Bayer Leverkusen suffered UEFA Champions League hangovers. Bayern were rarely troubled at home as striker Robert Lewandowski and Arjen Robben both netted twice even with Thomas Muller and FIFA World Cup winner Mario Gotze on the bench and with Germany star Bastian Schweinsteiger injured. Munich were 2-0 up after just 13 minutes as Lewandowski chested down a long ball and drilled his shot into the bottom corner, then Robben added a second after a trademark run through the heart of the Hannover defence. Lewandowski netted again just seven minutes before the break after coolly controlling a Juan Bernat pass and hitting the goal’s left corner. Bayern kept up the pressure in the second-half to kick-off celebrations on the last weekend of Munich’s Oktoberfest as Robben fired home his second with 11 minutes left. Pep Guardiola’s Bayern have now gone seven games without conceding a goal. Dortmund are now winless in their last four league games after their 1-0 defeat at home to Hamburg left them 13th in the table. Dortmund were a shadow of themselves after their impressive 3-0 win at Anderlecht in midweek as Hamburg picked up their first win of the season. This was Hamburg’s fourth victory over Dortmund in their last five meetings to leave Jurgen Klopp’s side two points above the relegation zone. Hamburg netted the first-half winner after sloppy defending. A poor pass from Dortmund’s striker Adrian Ramos was snapped up by Hamburg’s Marcell Jansen who fed Nicolai Muller and the right-wing sprinted away, drawing Borussia’s goalkeeper Roman Weidenfeller for Pierre-Michel Lasogga to slot into an empty net on 35 minutes. Ten-man Schalke also suffered an afternoon to forget after midweek Champions League action as they went down 2-1 at Hoffenheim, who moved up to second in the table. The Royal Blues found themselves behind after only 13 minutes as Norway’s Tarik Elyounoussi put the hosts into an early lead then Hungary striker Adam Szalai slotted home their second against his former club on 29 minutes. Schalke finished with ten men after Cameroon’s Joel Matip was shown a second yellow and subsequent red before Klaas-Jan Huntelaar scored a late consolation goal. Bayer Leverkusen dropped to fourth in the table after drawing 2-2 at home to ten-man Paderborn. Newly-promoted Paderborn took an early lead through midfielder Suleyman Koc before Leverkusen captain Lars Bender equalised for the Champions League side who picked up a midweek win over Benfica. Paderborn had ten men for the last 20 minutes after Marvin Bakalorz was shown a straight red after tackling Leverkusen’s Brazilian defender Wendell from behind. Moritz Stoppelkamp gave Paderborn a late lead before Karim Bellarabi celebrated his first Germany call-up with Leverkusen’s equaliser on the 90th minute. On Friday, Hertha Berlin enjoyed only their second league win of the season with a 3-2 victory at home to Stuttgart with Salomon Kalou scoring twice. Borussia Monchengladbach can reclaim second place on Sunday if they beat Mainz while mid-table sides Augsburg and Wolfsburg meet earlier.