Mitch Langerak’s VfB Stuttgart have fallen to their first loss in eight 2.Bundesliga matches, going down 1-0 at second placed Hanover.
Mooy's Huddersfield frustrated in Championship playoff
German midfielder Felix Klaus scored the game's only goal, beating Langerak just before half-time.
Stuttgart still lead Hanover on goal difference with one game remaining ensuring the title race will go down to the wire.
Meantime, Ben Halloran has started in Heidenheim's latest outing.
The 2014 Caltex Socceroo earned a second-half booking and was substituted shortly afterwards in his side's 1-0 win away at Union Berlin.
The win moves Heidenheim to eighth in the 18-team league.
