Willian is the hero after 45 minutes as his two goals have given Chelsea a comfortable 2-0 lead.
Chelsea had the first opportunity at goal after six minutes when Mount forced a pass into Abraham, whose shot on the turn went wide due to a lot of pressure from Alderweireld.
Chelsea took the lead in the 12th minute when Willian zipped infield, evaded a half-arsed challenge from Aurier and smacked an emphatic curling shot that flew through the crowd and into the far corner.
Chelsea had a dangerous counter-attack in the 24th minute when Abraham floats a lovely angled pass over the defence for Mount, who took it down on the chest and about to shoot when Sanchez came across to make a vital interception.
Four minutes later, Tottenham had their first best chance when Sissoko suddenly charged into the area on the right, cut the ball back towards Kane, but his snapshot from 10 yards went high over the bar.
There was drama in the 45th minute when Gazzaniga ran out, missed the ball completely and clattered into Alonso. But Anthony Taylor gave a foul to Spurs. After a VAR check, the penalty was awarded to Chelsea.
And Willian stepped up to make it 2-0.
Though Tottenham gradually came to the party and dominated play for the last ten minutes of the first half, it was Chelsea who takes lead at half-time.