Postpublished at 61 mins
Chelsea 2-0 Tottenham
Lucas Moura fizzes a pass out to Tanguy Ndombele and the substitute never quite gets it under control. Spurs are trying to get the midfielder into the game.
Use play icon at top of page to listen to live commentary from BBC Radio 5 Live
Spurs give ball away and Havertz shot deflects off Sanchez on the way in, comical own goal for second
Lukaku returns to Chelsea XI after apologising for comments in an interview
Second leg takes place on 12 January
Arsenal face Liverpool in other semi-final - first leg moved to 13 Jan
Final on 27 February
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Alex Bysouth
Chelsea 2-0 Tottenham
Lucas Moura fizzes a pass out to Tanguy Ndombele and the substitute never quite gets it under control. Spurs are trying to get the midfielder into the game.
Chelsea 2-0 Tottenham
Chelsea have managed to take the sting out of that faster start to the second half from Tottenham and are enjoying plenty of the ball again.
Hakim Ziyech's low ball from the right is met by Saul, but he can't coax an effort on target.
Chelsea 2-0 Tottenham
Timo Werner is looking to stretch the Spurs defence, he goes a little too early though and the flag is up.
Chelsea 2-0 Tottenham
Tanguy Ndombele finds some space on the edge of the box and fancies his chances, but skies an effort high and wide.
Chelsea 2-0 Tottenham
Lovely turn from Timo Werner, finding Romelu Lukaku who then helps it on to Hakim Ziyech.
He steadies himself, but curls an effort straight at Hugo Lloris.
Chelsea 2-0 Tottenham
A little flick on target from Romelu Lukaku but it's comfortable for Hugo Lloris.
Chelsea 2-0 Tottenham
Tanguy Ndombele has barely featured under Antonio Conte - apart from in the draw with Liverpool - but that extra man in midfield seems to be allowing Spurs more of the ball.
Saul slides in to make a great tackle on Son Heung-min, who was trying to create space for a shot.
Chelsea 2-0 Tottenham
Harry Kane stands over it. And forces Kepa into a low save! Decent strike.
Chelsea 2-0 Tottenham
Tanguy Ndombele is brought down on the edge of the Chelsea box. A chance to have a dig for Tottenham...
Chelsea 2-0 Tottenham
Another cross from the right for Spurs but another that doesn't find a team-mate - more intent already from Antonio Conte's side after the break, though.
Chelsea 2-0 Tottenham
Almost. Lucas Moura's cross from the right looks to be dropping on to the head of Son Heung-min, but Cesar Azpilicueta does superbly to get across.
Chelsea 2-0 Tottenham
Tanguy Ndombele is on for Tottenham, he replaces Matt Doherty.
Timo Werner is on for Kai Havertz for Chelsea.
Chelsea 2-0 Tottenham
Away we go for the second half.
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Chelsea 2-0 Tottenham
Tottenham didn't have a shot in the first half, never mind one on target.
Unless Antonio Conte's made several signings during the half-time break, it's hard to see how the visitors can get back into this one. Chelsea were far superior in the first half.
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Trevor Durham: A truly dreadful half of football from Tottenham. The only question would seem to be how are we not 3 or 4 down? Conte certainly has his work cut out.
Jan: There's a difference between working hard and intelligently off the ball, and running around like headless chickens. Tottenham are the latter.
Tarquind Duvall: awful half, Doherty backing off, Emerson losing the ball and Hojberg hiding. At least its a Transfer window, Levy watching???
Chelsea 2-0 Tottenham
Clinton Morrison
Former Crystal Palace striker on BBC Radio 5 Live
Spurs have got an outstanding front three who haven't touched the ball.
I'd take off a wing-back and put Sergio Reguilon on the left. I've seen Emerson Royal, people let him have the ball, he doesn't get crosses in. Conte could even put Lucas Moura at wing-back.
It should be all over because Lukaku had a great chance. If that goes in for 3-0 there's no way back for Tottenham.
They're missing Eric Dier, he's the main man in the back three.
Chelsea 2-0 Tottenham
Karen Carney
Former Chelsea midfielder on BBC Radio 5 Live
So far it's been total dominance. Not even a shot from Spurs, they've been really disappointing. Credit to Thomas Tuchel for changing to a back four and completely dominating the flanks.
You expect a reaction, to see Antonio Conte make changes tactically. There's plenty of time for them to get back into it.
Chelsea 2-0 Tottenham
After the full-throttle madness of Sunday's draw with Liverpool, Chelsea have barely had to get out of first gear to take full control at Stamford Bridge this evening.
Chelsea 2-0 Tottenham
Lucas Moura decides he might have to do it all by himself, but Chelsea have numbers back.
And that's the break.