DUESSELDORF, Germany (AP) — Is Bayer Leverkusen's German title challenge for real? How about Stuttgart's chances? The Bundesliga's two teams on the rise meet on Sunday when league-leading Leverkusen travels to third-placed Stuttgart. Leverkusen's 21-game unbeaten start to the season is on the line again after a rare moment of vulnerability in a 1-1 draw with Borussia Dortmund on Sunday. Stuttgart knocked Dortmund out of the German Cup on Wednesday and is aiming for another upset win in a season