Bundesliga leaders Bayern Munich saw their lead at the top of the league table cut to five points with six games left after they stumbled to a 1-1 draw at home against Union Berlin on Saturday conceding an 86th minute equaliser through Marcus Ingvartsen.
Teenager Jamal Musiala had put a second-string Bayern team ahead in the 68th minute, picking up a Thomas Muller pass and weaving past three players in the box before firing home.
Bayern, who were missing nine players through injury or illness, including Robert Lewandowski, dominated possession throughout but let their guard down four minutes before the end, allowing Ingvartsen to bundle in a cut-back.
Bayern were far from their best with an unusual lineup that included Josip Stanisic, who was making his senior debut, and rarely threatened.
They had endured a tumultuous week with their 3-2 home loss to Paris Saint-Germain in the Champions League quarterfinal first leg on Wednesday amid growing speculation regarding the future of coach Hansi Flick at the club.
Flick, a front-runner for the Germany job after the European Championship this summer, has had an uneasy relationship with Bayern sports director Hasan Salihamidzic over squad planning and before the game repeatedly refused to answer questions regarding his future at Bayern.
Bayern are now on 65 points, five ahead of second-placed RB Leipzig, who beat Werder Bremen 4-1 away.