Manchester City remained on course to lift the League Cup for a third successive season after overcoming third-tier Oxford United 3-1 on Wednesday and will face Manchester United in the semifinals.
Pep Guardiola's side were given a stern test on a wet and windy night at a noisy Kassam Stadium but two goals from Raheem Sterling eventually saw them through.
United were frustrated for 51 minutes at Old Trafford by fourth-tier Colchester United but England striker Marcus Rashford broke the resistance and an own goal by Ryan Jackson and one for Anthony Martial took the hosts to a 3-0 win.
Of a two-legged semifinal in January, United manager Ole Gunnar Solskjaer said: "Fantastic days in Manchester. You always want to win trophies and games and we have a nice little draw coming up, exciting times ahead."
Brendan Rodgers's side will face Midlands rivals Aston Villa in the semi-finals after Villa beat a virtual Liverpool youth team 5-0 on Tuesday. Liverpool's senior players were all in action on Wednesday in their FIFA Club World Cup victory over Monterrey.
City have dominated the League Cup under Guardiola but rarely have they been tested quite like they were by Oxford who managed 18 goal attempts, more than any side against City since the Spaniard took charge.
City made eight changes to the team that beat Arsenal on Sunday and lacked their usual authority but they did take the lead in the 22nd minute with Joao Cancelo's deflected effort.
They were caught napping, however, when Matty Taylor rammed home an equaliser 22 seconds into the second half.
Sterling restored City's lead in the 50th minute, touching in Angelino's cross, but Oxford took charge for a 20-minute spell in which they outplayed their illustrious guests.
Mikel Arteta, favourite to get the vacant Arsenal job, took his place next to Guardiola on the City bench in what could be his final game as assistant manager.
Guardiola would not be drawn on that situation.
"We suffered a lot in the second half. At 2-1 they play long balls with throw-ins, corners and we struggled but it's okay, we knew before we came here," Guardiola said.
"We play against a top side so congratulations for the team, young players and the victory."
Oxford manager Karl Robinson said he was "frustrated" that his side had not taken their chances.
"I am really pleased with the players but my last thought tonight will be 'what could have been'."
Everton's hopes of a glorious comeback victory in Duncan Ferguson's third game as caretaker manager went flat, though, as Kasper Schmeichel made two saves in the shootout.
Leicester are in the League Cup semifinals for the first time since the 1999-2000 campaign, when they won the trophy.