Chelsea's incredible defensive record continued as they were able to grind out a 2-0 win over Sheffield United in the FA Cup and head through to the semi-finals.
It was a game in which Thomas Tuchel's side didn't create too many chances and indeed the visitors, who are rock bottom of the Premier League, had the better of the second half and should have probably equalised.
Chelsea 2-0 Sheffield Utd: Kepa and Pulisic make excellent contributions
But their defensive capabilities came to the fore once again and Tuchel's men have now went over 11 hours at home without conceding a goal.
It was another experimental line-up from the German, opting for three at the back and employing 19-year-old Billy Gilmour in the centre of his midfield.
Christian Pulisic was also brought into the team and the American was Chelsea's most creative player on the day, unlucky not to score in both halves. His quick thinking drew a mistake in the first half and only a good stop from Aaron Ramsdale denied him.
And in the second half his beautiful change of direction took him past three United defenders only for Ramsdale to deny him again.
The first goal of the game came courtesy of a Ben Chilwell strike which deflected off Oliver Norwood and spun into the net, and despite much possession Chelsea couldn't expand on their advantage.
And in the second half David McGoldrick drifted into a perfect position six yards out, but somehow stooped to direct his header wide of the target in what was a guilt-edged chance.
But Chelsea sealed the win in injury time, Chilwell feeding substitute Hakim Ziyech inside the area, who took a touch before slamming low into the corner of the net.
Chelsea join Manchester City and Southampton in the last four of the FA Cup, with Leicester and Manchester United facing off at 17:00GMT.
Substitute in, Lys Mousset.
Substitute out, Jayden Bogle.
Assist given by Ben Chilwell.
Goal by Hakim Ziyech.
Substitute in, N'Golo Kanté.
Substitute out, Christian Pulisic.
Substitute in, Rhian Brewster.
Substitute out, Oliver Norwood.
Substitute in, Oliver Burke.
Substitute out, Oliver McBurnie.
Substitute in, Hakim Ziyech.
Substitute in, Kai Havertz.
Substitute out, Billy Gilmour.
Substitute out, Callum Hudson-Odoi.
Substitute in, Cesar Azpilicueta.
Substitute in, Reece James.
Substitute out, Andreas Christensen.
Substitute out, Olivier Giroud.
Own goal by Oliver Norwood.