Manchester City defeated Leicester on penalties Tuesday to advance to the semi-finals of the Carabao Cup.
Goalkeeper Claudio Bravo, who saved two spot-kicks in the previous round against Wolves, was again the visitors' hero - keeping out Riyad Mahrez's effort after Jamie Vardy had hit the post.
With both teams fielding second-string sides at the King Power Stadium, visiting winger Bernardo Silva scored the opener in the first half, slotting home his second goal of the season following Ilkay Gundogan's powerful run from the halfway line.
Leicester's Jamie Vardy had tied the game at 1-1 in the seventh minute of extra time with a goal off a highly disputed penalty call.
CARABAO CUP
Tuesday's results
Arsenal 1-0 West Ham United
Leicester City 4-5 (3-4 penalties) Manchester City
Wednesday's matches (02.45am Thailand time Thursday)
Chelsea vs AFC Bournemouth
Bristol City vs Manchester United
The draw for the semi-finals is scheduled to take place after full-time in Wednesday's matches,, with the two-legged home and away ties to be played in January.
Arsenal meanwhile booked their place in the semi-finals as Danny Welbeck's solitary goal settled a tight encounter with West Ham.
Arsenal manager Arsene Wenger, who made 11 changes from the weekend win over Newcastle, saw his side struggle to break down the defensively resolute visitors in the first half.
But England forward Welbeck broke West Ham's resistance just before the break, turning in Mathieu Debuchy's header across goal.
The Gunners' night was soured when they lost Olivier Giroud to a suspected hamstring injury in the second half, but they remain in the running for a first Carabao (League) Cup win since 1993.
Hammers boss David Moyes also saw a much-changed side fail to click in attack, with the belated introductions of Andy Carroll, Diafra Sakho and Marko Arnautovic failing to undo the home defence.
Neither Joe Hart, restored to the West Ham side for the rested Adrian, nor Arsenal's second-choice goalkeeper David Ospina were forced into much action in what was a disjointed contest.
In FA Cup play, Hallam Hope's first-half double steered Carlisle United to a 3-1 home win against Gillingham and a third-round meeting with Sheffield Wednesday.
Hope fired home via deflection early on to put Carlisle in front, and doubled the lead finishing off Richie Bennett's cut-back for a 2-0 lead at the break.
Scott Wagstaff scored shortly after half-time, tucking in a cut-back by Josh Parker to give the Gills a chance.
Shaun Miller ended their hopes with the Cumbrians' third in injury-time.
