Cardiff lose at home to Championship Norwich
West Ham avoid scare at 10-man AFC Wimbledon
Burton knock out Aston Villa; Palace, Fulham & Southampton through
Berahino scores first goal since Feb 2016 as Stoke beat Huddersfield
Image source, Getty ImagesSome good news to bring you...
If scores are level after 90 minutes, matches go straight to penalties. There will be no extra-time.
Penalty format reverts to the usual ABAB concept after the ABBA version was trialled last season.
And VAR is back...at matches being staged at Premier League grounds.
And here are the rest of tonight's games. All 19:45 BST kick-offs unless stated otherwise.
Swansea City v Crystal Palace (19:30)
AFC Wimbledon v West Ham United
AFC Bournemouth v Milton Keynes Dons
Brentford v Cheltenham Town
Brighton & Hove Albion v Southampton
Cardiff City v Norwich City
Fulham v Exeter City
Newport County v Oxford United
QPR v Bristol Rovers
Wycombe Wanderers v Forest Green Rovers
A quick rundown of the games we have for you tonight. All 19:45 BST kick-offs unless stated otherwise.
Blackburn Rovers v Lincoln City
Burton Albion v Aston Villa
Doncaster Rovers v Blackpool
Hull City v Derby County
Leeds United v Preston North End
Leicester City v Fleetwood Town
Middlesbrough v Rochdale
Sheffield Wednesday v Wolves
Walsall v Macclesfield Town
Stoke City v Huddersfield Town (20:00)
West Bromwich Albion v Mansfield (20:00)
The Football League sides that progressed from the first round are - obviously - competing and they are joined by 13 Premier League sides.
Champions League qualifiers Manchester City, Manchester United, Tottenham and Liverpool, as well as Europa League contestants Chelsea, Arsenal and Burnley all come in at the third round stage.
Image source, Getty ImagesIt's the first major piece of silverware on offer this season, as clubs continue on their path to February's Carabao Cup final.
Interest hots up in the second round, as the boys from the Premier League enter the fray.
Welcome to a bumper night of League Cup action.