Scott McDonald earned Middlesbrough a quarter-final place with a hard-fought 1-0 victory over Sunderland in their Wear-Tees derby at the Stadium of Light.
The striker, who was handed a start by Boro boss Tony Mowbray after he scored both of the goals in last weekend's 2-1 Championship win over Bolton from the bench, scrambled the ball home from six yards at the near post late in the first half.
It was enough for Middlesbrough to progress as Sunderland lacked the cutting edge that has seen them draw six of their eight Barclays Premier League games so far this season.
Leeds secured another top-flight scalp as they brushed aside Southampton 3-0 at Elland Road.
Saints manager Nigel Adkins' decision to make 11 changes backfired on him as goals from Michael Tonge, El-Hadji Diouf and Luciano Becchio saw the home side through.
It took until the 70th minute for Southampton, who have been struggling in the Premier League this season, to register a shot at goal and it will be Leeds, third-round conquerors of Everton, who enter the hat on Wednesday night for a first quarter-final appearance since 1996 - a year they made the final.
Aston Villa are through to the quarter-finals for the third time in four seasons after Christian Benteke scored a late winner in a 3-2 victory over Swindon at the County Ground.
Villa looked to be cruising to victory as goals from Benteke - a £7million summer signing from Genk - and Gabriel Agbonlahor earned them a 2-0 half-time lead.
But the npower League One side, who had already overcome Stoke in this season's competition, fought back through two goals from substitute Miles Storey before Benteke had the final say.
It was his third goal in two games and Villa boss Paul Lambert will hope his side can build on this success after their worst start to a league campaign in 43 years.
Captial One Cup fourth-round results:
Leeds 3 Southampton 0,
Reading 4 Arsenal 4, (after 90 minutes, extra-time being played)
Sunderland 0 Middlesbrough 1,
Swindon 2 Aston Villa 3.
Wigan 0 Bradford 0 (after 90 minutes, extra-time being played).
Bayern Munich are kings of Germany and hope to be crowned kings of Europe at Wembley later this month!
Ajax has released their away soccer jersey for the 2013/14 season. Get in the Gear.
Borussia Dortmund hears Wembley Calling and are headed to London for the Champions League final.
The new PUMA evoSPEED 1.2 FG. A great new soccer cleat with classic look and first time for PUMA to be on the cleat.
The Liverpool 2013/14 soccer jersey is available for pre-order. The Reds are eager to compete for silver next season.
Chelsea won the Europa League on Wednesday. The Blues defeated Benfica 2-1 on injury time goal from Ivanovic.
The adidas Nitrocharge is the most talked about new cleat in years. It was released on May 15 and will take your pitch by storm.
adidas has added some color to the Predator line with this new colorway. Released on May 17. Be the first to own a pair.
The Juventus jersey for the 2013/14 was released earlier this week. Be the first to wear the colors of the Old Lady.
The push for more color on their cleats, adidas has added the infrared colorway to the adiZero f50 Line.