Promoted Mainz, where Egyptian forward Gamal Hamza plays, widened the misery of Bayern Munich with a 2-1 home victory in the Bundesliga on Saturday. Austrian forward Andreas Ivanschitz fired the hosts in front after 25 minutes when his low shot squirmed beneath the body of Bayern keeper Michael Rensing. Burkina Faso striker Aristide Bance extended Mainz's advantage seven minutes before the break when he towered unmarked to head home a right-wing cross. An own goal Mainz defender Nikolce Noveski narrowed the gap but it wasn't enough to help Bayern get something from the game. The Bavarian giants extended their winless streak to three matches as they are yet to claim their first Bundesliga victory under new coach Louis van Gaal. They drew with Hoffenheim and Werder Bremen before facing Mainz, who now have five points from three games. Hamza was once again left out of Mainz's squad as he is yet to make his first competitive appearance with the team he joined in the close season after his contract with Zamalek expired. Elsewhere, Mohamed Zidan's Borussia Dortmund failed to keep a one-goal lead intact to draw 1-1 at Stuttgart. Striker Zidan, who was snubbed by Egypt coach Hassan Shehata for failing to show up for the national team's friendly game with Guinea, was kept on the bench throughout the game. Mainz's first goal Mainz's second goal Bayern's goal