Bruno Labbadia expects a very difficult relegation battle in the Bundesliga ahead of his debut for his second term as VfB Stuttgart coach. “We have a marathon ahead of us. It’s going to be a tough race, our competitors are also gearing up. We have to be prepared for it,” he told a news conference on Thursday. Stuttgart resume their season on Saturday against Mainz, Labbadia’s first game since taking over during the winter and World Cup break after Pellegrino Matarazzo was dismissed. “I have huge respect for the relegation battle because so many things play a role, things you have no influence….