FIFA made them mandatory at the 2026 World Cup. Coaches call them momentum killers. Here's what all 104 matches of data actually say.
THE CLAIM
Stop a team that's flying, and the spell breaks.
Coaches and pundits call the breaks momentum killers. It's the conventional wisdom, so we measured it.
AFTER A HYDRATION BREAK
−22
momentum, team on top
The leading side really does sag after a break. On the surface, the momentum killer looks real.
…BUT WITH NO BREAK
−17
same teams, quiet minutes
The same teams sag at break-free minutes too. Most of the drop is just regression to the mean: a hot spell cooling off on its own.
WHAT'S LEFT OVER
3
points below no break
95% CI -0 ··· +7
The break sits about 3 points below the same teams with no whistle, but even across the full tournament, that gap's 95% interval (-0 to +7 points) still includes zero, not distinguishable from no effect.
WC2026 · STOPPAGE MOMENTUM
The finished analysis.
All 104 matches, June 11 to the July 19 final. Every number traces to the committed dataset.
