Teenager Fran Merida netted his first Arsenal goal as Arsene Wenger's young Gunners beat Liverpool 2-1 to reach the quarter-finals of the Carling Cup.
Just back from the Under-20 World Cup with Spain, the 19-year-old former Barcelona trainee drilled in a fine goal in the 18th minute as Wenger's faith in youth was once again justified.
Emiliano Insua equalised for Liverpool in the 26th minute with another scorching shot in an open first half.
Nicklas Bendtner, now a regular in the side but coming back from an injury sustained in a car crash, produced a powerful finish after 50 minutes to put Arsenal into the last eight.
Chelsea cruised into the quarter-finals with an easy 4-0 fourth-round victory over Bolton at Stamford Bridge.
First-half goals from Salomon Kalou and Florent Malouda put the home side in command before Deco and substitute Didier Drogba finished off Gary Megson's side after the break.
Bolton wasted a couple of chances to reduce the arrears but Chelsea were always in control despite the loss of goalkeeper Hilario through injury in the first half.
The win maintained Chelsea's 100% home record under new coach Carlo Ancelotti and even without the likes of rested captain John Terry and his England team-mate Frank Lampard, the Blues continue to look very good at home.
Manchester City cruised into the Carling Cup quarter-finals, brushing aside an outclassed Scunthorpe 5-1.
The Championship side had tried their best at Eastlands in this fourth-round tie, and at one stage produced a fine first-half equaliser from Jonathan Forte after Stephen Ireland had given City an early lead.
But City were ahead by the break through Roque Santa Cruz, and second-half goals from Joleon Lescott, Carlos Tevez and Michael Johnson set the seal on a commanding performance.