Chelsea deservedly beat Tottenham in the first leg of the Carabao Cup semi-final, but had so many chances they should have already sealed their place at Wembley.
Kai Havertz gave Chelsea an early lead when he ran onto Marcos Alonso's through ball and fired home with Davinson Sanchez unable to keep the shot out on the line.
The Blues' second was a comedy own goal as Japhet Tanganga headed the ball into team-mate Ben Davies' shoulder and it flew into the net.
Romelu Lukaku, back in the team after a one-game exile for comments he made in an interview, had several chances and headed wide from close range.