Bayer Leverkusen returned to winning ways after their midweek 1-0 Champions League defeat to Lazio by beating Hannover 1-0 at the Niedersachsenstadion on Saturday.A trademark Hakan Calhanoglu free-kick in the 18th minute was enough to earn Roger Schmidt's men all three points and keep them on maximum points from their first two Bundesliga games of the season, after they beat Hoffenheim on the opening weekend.Hannover barely put up a fight in front of their own fans, having struggled in their opening game at Darmstadt a week ago.The alarm bells may already be starting to sound after Hannover only just avoided relegation last season, while Leverkusen will go into the return leg of their Champions League play-off on Wednesday in confident mood.