Freiburg missed their chance to finish first in the table for only the third time in their history.
Despite the scoreline, Freiburg’s game featured attacks from start to finish, with both teams denied by an excellent goalkeeper.
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Union and defending champions Bayern Munich are the only two teams still unbeaten in the Bundesliga this season.
“We’re doing well. That’s why we are where we are,” captain Christopher Trimmel told DAZN.
It was Cologne’s first league loss of the season and kept them seventh in the table.
“I haven’t seen a team play as well here as Union for a long time.
“You have to admit that the plan we had didn’t work at all.”
The visitors started the game at a blistering pace, taking the lead in just four minutes.
Just four minutes later, referee Benjamin Cortus awarded Union a penalty for a handball, but Siebatcheu’s tame effort was easily saved by Cologne goalkeeper Marvin Schwaebe.
Becker had the ball in the net again a minute later, but his superb shot was ruled out for offside.
Despite commanding possession, Cologne failed to fight their way through with Union often dangerous on the counter.
Cologne fell to 10 men in the 81st minute when Luca Kilian picked up his second yellow card for a tactical foul on Andras Schaefer.
Freiburg misses its first chance
In Sunday’s final match, Freiburg missed their chance to move up to the top and are one point behind Union in second.
Thuram and midfielder Jonas Hofmann each had chances in the 29th minute but were again denied by Flekken.
Although both teams claimed a point, the different reactions from the coaches showed what was at stake.
“Gladbach was very flexible. We couldn’t defend everything in the first half. In the second half we had a lot of mentality and conviction,” Freiburg coach Christian Streich told AFP. of the SID.
“We gave it our all and wanted to win at all costs.”
On the other hand, Gladbach coach Daniel Farke praised his team’s performance.
Gladbach coach Daniel Farke said: “I couldn’t be happier with the performance. We were totally dominant in the first half (but) we missed the chance to take the lead.”
Freiburg will focus on a Europa League trip to Olympiakos midweek.