An early own goal by Timo Hubers was enough to reach the summit, although they squandered the chance to double the lead soon after when goalkeeper Marvin Schwabe saved Jordan Siebatcheu’s penalty.
Cologne’s Luca Kilian was sent off for a second yellow card nine minutes from time.
When Bill Nicholson said that football was all about the glory, well, for most of us, we'd have said that was rubbish. However there are occasional moments, like today. Look at our men, look at our women. Unioner, we are so proud of you. Enjoy it, love it. For we love you. pic.twitter.com/1LjWgwp86E
— 1. FC Union Berlin (@fcunion_en) September 11, 2022
Union’s place at the top was secure after Freiburg had to settle for second place following a goalless draw at home to Borussia Monchengladbach.
Vedat Muriqi’s 35th-minute goal looked like giving the visitors a half-time lead but Federico Valverde equalised just before the break and Vinicius Jr, Rodrygo and Antonio Rudiger turned things around in the second half.
Real Sociedad, Europa League winners over Manchester United at Old Trafford, lost 2-1 at lowly Getafe, who registered their first win of the season.
— Real Madrid C.F. 🇬🇧🇺🇸 (@realmadriden) September 11, 2022
Unbeaten Atalanta were held to a 1-1 draw at home to newly-promoted Cremonese and missed the chance to regain top spot from Napoli in Serie A.
Merih Demiral had put the hosts ahead in the 74th minute but his goal was cancelled out four minutes later by Emanuele Valeri.