Who can stop Bayern?

What does it mean when the most successful club in German history loses 4-1 to a side fighting for mid-table? For Bayern München, Saturday's capitulation in Cologne was a reminder that even the best systems crack under pressure, but also that the Bundesliga title race remains stubbornly theirs to lose.

Bayern's 32 points from 15 games keep them three clear of Hamburger SV, who remain unbeaten after 15 matches but have drawn eight. The champions' defeat was their third of the season, yet none of their rivals have shown the consistency to capitalise. Dortmund, third, could only draw 0-0 at home to St. Pauli, while RB Leipzig, fourth, have a game in hand but sit five points back.

The Cologne result was not just a blip; it was a dismantling. Bayern conceded four times to a side that began the day 11th, the goals coming in a flurry that left the visitors chasing shadows. The defeat exposed the fatigue that has been creeping into Bayern's play since the autumn—a tiredness that was already visible in their goalless draw with Freiburg two weeks ago, when they played the last ten minutes with ten men.

But Bayern's crisis is relative. They still lead the league, and their goal difference of +14 is second only to Dortmund's +17. The question is not whether Bayern can win the title—they have won 24 of the last 51 Bundesliga crowns—but whether anyone else can summon the nerve to challenge them.

Hamburg's unbeaten run is impressive, but their eight draws tell a story of caution. On Saturday they beat Greuther Fürth 3-1, a result that kept them in touch but did little to suggest they will push Bayern all the way. Dortmund's 0-0 with St. Pauli was another missed opportunity, their seventh draw of the season. Leipzig, the only other side with a realistic chance, have played a game fewer but have already lost three times.

At the bottom, Bayer Leverkusen's 2-0 defeat in Mainz left them rooted to the foot of the table with six points from 16 games. Their fall has been stark: a club that once challenged Bayern for titles now faces the real prospect of relegation. Arminia Bielefeld and Hoffenheim are also in trouble, but Leverkusen's crisis is the most acute.

Bayern's defeat in Cologne may prove to be a turning point, but not in the way their rivals hope. It is a wake-up call for a squad that has looked jaded, and a reminder that the Bundesliga's long winter break—still two weeks away—cannot come soon enough. The champions will regroup, as they always do. The real story of this season may be not whether Bayern win the title, but whether anyone else dares to believe they can stop them.