A deflected goal from defender Johannes Flum was enough to earn Freiburg all three points with a 1-0 win over Borussia Monchengladbach at the Dreisamstadion.
It was only Freiburg's second win of the season and it denied in-form Gladbach the chance of joining Bayern Munich at the top of the table.
The win also lifts some pressure off Freiburg coach Marcus Sorg, whose side moving out of the bottom three as a result of this success.
Flum scored the only goal of the game in the 19th minute with a deflected shot from just outside the penalty area.
The touch that Monchengladbach defender Thorben Marx got to the ball was significant enough to leave his goalkeeper Marc-Andre ter Stegen without a chance.
Freiburg's problem this season has not been scoring goals, though - only four Bundesliga clubs have scored more - but their defensive record is the worst in the league.
Their priority after taking the lead was therefore ensuring they did not concede, and they collectively set about keeping Monchengladbach away from their goal.
It worked well with the only effort from the visitors on their goal in the first half coming from Igor de Camargo's 25-yard effort over the crossbar.
Freiburg could have doubled their lead in the 53rd minute when their captain Heiko Butscher met Julian Schuster's free-kick, but ter Stegen made a fine save to deny him.
The expected late rally from Gladbach arrived with 15 minutes remaining.
Dante headed Juan Arango's free-kick just over the crossbar in the 75th minute before going even closer with another header a minute later, but Oliver Baumann made a fine save to keep only his second clean sheet of the season.