A majestic, dominant, intimidating performance from Bayern Munich ended this tie as a contest; a bedraggled, outclassed, chastened Chelsea can only hope the second leg is kept social. If the Bavarians fancy it; they could impose an even more painful evening in the second leg of the Champions League knock-out tie.
Bayern had the better of an entertaining first half; controlling the majority of territory and possession while creating the better of the chances.
The closest they came was when Thomas Muller – by far the best player on the pitch – swivelled to plant a back-header against the bar; but Willy Caballero had to be alert on various occasions to deny Robert Lewandowski.
Chelsea, though, also looked lively in attack, Mason Mount flitting about to good effect.
But Bayern stepped it up another level in the second half; constructing three simple yet glorious goals in just 15 minutes.
The first two were made by Robert Lewandowski for Serge Gnabry, who now has six in two visits to London this season, and the third put on a plate for Lewandowski by the wonderful Alphonso Davies.
As Chelsea lost their discipline, Marcos Alonso was sent off for chucking first elbow and then hand at Lewandowski, though perhaps he – and Jorginho, who has needlessly incurred a booking for dissent – knew what they were doing, getting themselves suspended for the ordeal that awaits them in Munich.
As for Bayern, they looked a grooved, cohesive and easily good enough unit to threaten the favourites.