Hamburger SV is threatened with another unsuccessful attempt to return to the Bundesliga.
After the 0:1 (0:1) in the north derby at Holstein Kiel, the distance to the relegation place three is already seven points.
This means that the traditional club is likely to face a fifth season in the German lower house of football.
The goal from Kiel's Kwasi Okyere Wriedt (13th) sealed the sixth defeat of the season.
The game was interrupted in the second minute.
Hamburg fans ignited firecrackers and bengalos, swathes of intoxication swept through the sold-out Holstein Stadium.
Referee Daniel Schlager sent both teams into the cabins.
After a ten-minute break, the game resumed.
Meanwhile, SV Sandhausen achieved an important success in the fight against relegation.
Thanks to goals from Dario Dumic (7th) and Erik Zenga (48th) to make it 2-1 (1-0) over Dynamo Dresden, coach Alois Schwartz's team secured 15th place in the table and are now six points behind third from bottom from Saxony.
In the third game this Sunday, SC Paderborn saved a 2:2 (1:1) against Karlsruher SC when outnumbered.
Kai Pröger (30'/84') scored both goals for the hosts, who had to do without his defense chief following a red card for Uwe Hünemeier (47'/gross foul play).
Marvin Wanitzek (36th) and Philipp Hofmann (69th / according to video evidence) with his 50th goal in the 100th game for KSC had meanwhile ensured the lead for the guests.
The new table leader is FC Schalke 04, who, after beating 1. FC Heidenheim 3-0 (1-0) on Saturday, are in a promotion spot for the first time this season.
The 1-1 (1-0) in the top game between FC St. Pauli and Werder Bremen paved the way for the district club from fourth place to the top.