German Cup winners RB Leipzig made a frustrating start to the new Bundesliga campaign as they were held to a 1-1 draw at VfB Stuttgart on Sunday. Christopher Nkunku started as he finished last season with the opening goal in just nine minutes but Naouirou Ahamada netted a lovely equalizer before the break. Leipzig had the better of the chances to seal three points but Stuttgart, who only narrowly retained top-flight status, held on to claim a useful draw. The opening weekend concluded with Schalke losing on their return to the top-flight, 3-1 at Cologne. Champions Bayern Munich began their bid…