The London club were grateful to extra-time goals by Christopher Nkunku, Pedro Neto and Kiernan Dewsbury-Hall to give them a 4-1 victory over Benfica.
Their late burst of scoring settled a last-16 tie which took four hours, 39 minutes to complete at Charlotte’s Bank of America Stadium in North Carolina after a near two-hour weather delay.
Chelsea manager Enzo Maresca was left satisfied with his team’s victory but slammed the delay that turned the tie into a near five-hour marathon.
“I think it’s a joke, it’s not football,” Maresca said.
“For 85 minutes we were in control of the game. We created enough chances to win the game. Then after the break, the game changed — for me personally, it’s not football.”
Earlier, Chelsea had been seemingly poised for victory after Reece James’ opportunistic second-half free-kick had left them 1-0 up with four minutes of regulation time remaining.
But just as Chelsea began to think about their quarter-final assignment, the arrival of a storm over Charlotte triggered local safety protocols which required the game to be halted.
It marked the sixth occasion during the Club World Cup that a game has been disrupted by a weather warning.
When play resumed just under two hours later, a revitalised Benfica grabbed an injury-time equaliser after Chelsea substitute Malo Gusto was adjudged to have handled in the penalty area following an intervention by the Video Assistant Referee.
Benfica’s Argentine veteran Angel Di Maria stepped up to roll in an ice-cold penalty, sending the game into extra time.
An end-to-end first half of extra time saw Benfica, reduced to 10 men following Gianluca Prestianni’s second yellow card at the end of regulation, threaten to take the lead as they chased an improbable victory.
But instead it was Nkunku who fired Chelsea back in front, the French international bundling in from close range after Moises Caicedo’s low shot squirted underneath Benfica goalkeeper Antoliy Trubin.
As the game opened up, Benfica were increasingly vulnerable on the counter-attack and Chelsea pounced.
Neto made it 3-1 with a nerveless finish after going clean through on goal in the 114th minute, and three minutes later Dewsbury-Hall completed the rout to send Chelsea through to the last eight.
They will now return to Philadelphia, where they played two games in the group stage, to play Palmeiras in the quarter-finals on Friday.
The Brazilian club were grateful to an extra-time winner by substitute Paulinho as they edged domestic rivals Botafogo 1-0 in a battle of attrition earlier Saturday at Lincoln Financial Field in Philadelphia.
The winger came on at the same time in the second half as Palmeiras coach Abel Ferreira withdrew teenage sensation Estevao Willian, a move that appeared baffling in the moment but ultimately proved inspired.
The tie had reached the 100th minute without a goal when Paulinho collected a pass by Richard Rios on the right flank and was afforded the time and space to come inside into the box before slotting a low shot into the far corner.
That sparked wild celebrations among the Palmeiras fans who made up the vast majority of the 33,657 crowd, and the side from Sao Paulo held on to win the tie despite having captain Gustavo Gomez sent off late on.
“That is why he came, so he could play for long enough to decide a game. He is going to have to stop again after the tournament,” Ferreira said of Paulinho, who has struggled with injury since signing for Palmeiras at the start of the year.
Winners of the Copa Libertadores in 2020 and 2021, Palmeiras will now hope to match the feat of their Brazilian rivals Flamengo, who defeated Chelsea during the group stage.
The last-16 action continues on Sunday when European champions Paris Saint-Germain take on Lionel Messi’s Inter Miami in Atlanta. Later on Bayern Munich face Flamengo in Miami. (AFP)