Cool Kai Havertz delivers in heat of moment to send Chelsea into quarters 

Chelsea's only chance of a success this season is to win this trophy, and if they continue to ride their luck like this, who knows how far they can go.

COOL KAI: Chelsea's Kai Havertz scores their side's second goal of the game. Pic: John Walton/PA Wire.

CHELSEA 2 (Sterling 43, Havertz pen 53) BORUSSIA DORTMUND 0 

MAYBE GRAHAM POTTER is a wizard after all.