Bayern Munich lost on the opening day of the Bundesliga season for the first time since 2001 as they went down 1-0 at home to Borussia Monchengladbach.
Gladbach, who beat Bayern by the same scoreline in the first game 10 years ago, repeated history to spoil Jupp Heynckes' third debut in charge of the Bavarians.
It proved to be an even worse bow for Bayern's new number one Manuel Neuer as his glaring error allowed Igor de Camargo to score the only goal of the game in the 62nd minute.
In Sunday's other game, defensive failings cost Bayer Leverkusen as they opened their Bundesliga season with a 2-0 defeat to Mainz.
Goalkeeper Fabian Giefer's poor clearance allowed Sami Allagui to open the scoring before half-time and Omer Toprak's late own goal ensured there would be no way back.
Thomas Tuchel's side suffered a shock Europa League elimination on penalties against Gaz Metan in the third qualifying round, and they will be pleased to have bounced back to form at the new Coface Arena.
On Saturday, Stuttgart baptised their newly-renovated Mercedes-Benz Arena in style with a 3-0 win over Schalke.
Cacau, Martin Harnik and Shinji Okazaki were on target for Bruno Labbadia's side as they made light work of the Royal Blues, whose defence failed to impress.
Stuttgart could even have won more comfortably but missed numerous chances to punish their opponents' defensive shortcomings.
Patrick Helmes struck twice as Wolfsburg downed 10-man Cologne 3-0 to make a flying start to the new season having narrowly avoided relegation last term.
Helmes put the Wolves ahead in the 17th minute and then doubled his account late on as Felix Magath's side added two more goals in the final five minutes, Marcel Schafer the other man on the scoresheet after netting direct from a corner.
A second-half brace from Markus Rosenberg helped Werder Bremen to an opening-day 2-0 win over Kaiserslautern.
There had been little in the game until the Swede struck his first on the hour mark, with a second nine minutes from time wrapping things up.
Kaiserslautern could have few complaints about the result either, creating just two chances in a largely drab performance at Westerstadion.
Hannover enjoyed a winning start after downing Hoffenheim 2-1 at the Niedersachsen Stadion.
All three goals came in the opening 30 minutes with Jan Schlaudraff putting Hannover ahead, Sejad Salihovic equalising from the spot for Hoffenheim, and then Mohammed Abdellaoue netting the winner with another penalty.
Hannover finished fourth last term to qualify for the Europa League and they looked keen to prove that was not a one-season wonder as they started on a winning note.
Sascha Molders' second-half double ensured Augsburg were not beaten in their first ever Bundesliga match as they drew 2-2 with Freiburg.
Molders twice dragged the newcomers back after falling behind to goals from Papis Demba Cisse and Cedric Makiadi after the interval.
Cisse picked up where he left off from last season, when he top-scored with 22 goals, to fire Freiburg ahead on 48 minutes.
Molders' first equalizer arrived on 57 minutes, and while the celebrations were cut short when Makiadi sent the visitors back ahead almost immediately, he struck again nine minutes from the end to snatch a point.
Hertha Berlin's return to the Bundesliga ended in disappointment as Tomas Pekhart's 80th-minute goal earned Nurnberg a 1-0 win.
The visitors were good value for the victory, creating most of the chances in front of a crowd of 61,118 at the Olympic Stadium.
On Friday night, Borussia Dortmund made it clear that they will not give up their Bundesliga title easily with an emphatic 3-1 win over Hamburg in the opening top-flight fixture of the season.
The Westphalians dominated the game almost at will and could have won more comfortably against a woeful Hamburg side, who nevertheless managed a late consolation.
A Kevin Grosskreutz brace and a goal from the livewire Mario Gotze had already put the result beyond doubt, however, and gave the defending champions a perfect start to the season in front of a full house of over 80,000 at the Westfalenstadion.