Borussia Dortmund was in deep crisis before the World Cup break. Striker Sebastian Haller underwent surgery and chemotherapy after cancer was discovered in his body.
From the moment he returned to the field in January, the momentum shifted. From sixth place to the top of the Bundesliga in just six months. Dortmund just one win away from a historic championship that would put an end to Bayern's 10 consecutive successes. Bayern would have functioned normally, but the comeback has arrived, and it will likely be especially sweet if the team manages to beat Mainz at home this Saturday.