Match ends, MK Dons 0, Southampton 6.
Jay Rodriguez, Sadio Mane and Shane Long each scored twice as Southampton thrashed MK Dons in the League Cup.
Rodriguez curled a shot in off the post to put the visitors in front before Mane slotted in from a tight angle.
Mane then produced a composed finish after a cross from Long, who was fouled as MK Dons conceded a penalty which Rodriguez converted.
A Kyle McFadzean clearance hit Long in the chest and went in before the Saints striker slotted in his second.
This was the first time MK Dons, who have lost their past four Championship games, had conceded six goals in a competitive game.
Rodriguez, who returned from a 16-month injury lay-off at the start of this season, was back to somewhere near his best for Saints.
The 26-year-old had not scored two goals in a game since a 4-0 victory over Newcastle in March 2014.
He contributed to an improved performance from Ronald Koeman's side, who have won just once in their opening six Premier League matches.
They will host Aston Villa in the fourth round.
League Cup fourth round draw
Manchester City v Crystal Palace
Liverpool v Bournemouth
Manchester United v Middlesbrough
Everton v Norwich City
Southampton v Aston Villa
Sheffield Wednesday v Arsenal
Hull City v Leicester City
Stoke City v Chelsea
(Ties to be played on 27 and 28 October)
Southampton manager Ronald Koeman: "The whole team worked well - the defenders, the midfielder and the strikers.
"We had a good start and two fast goals gave us the confidence and total domination in the game.
"The final result is very pleasing and I think we showed from the first minute to the last second the great spirit in the team."
MK Dons manager Karl Robinson: "I found myself applauding some of their football at times. That is a team that wants to win the competition.
"We are a little embarrassed and upset, I admit. But they are a very good side and hopefully my players and I can learn something from this game."
- 18AguzaSubstituted forReevesat 57'minutes
- 23BenaventeSubstituted forHallat 36'minutes
- 11ChurchSubstituted forMaynardat 58'minutes
- 2Cédric Soares
- 6José Fonte
- 17van DijkSubstituted forYoshidaat 79'minutes
- 33TargettSubstituted forBertrandat 55'minutes
- 10ManéSubstituted forRamírezat 65'minutes
- Keith Stroud
- Shots on Target
Second Half ends, MK Dons 0, Southampton 6.
Attempt saved. Daniel Powell (MK Dons) right footed shot from outside the box is saved in the bottom left corner.
Attempt missed. Jay Rodriguez (Southampton) header from the left side of the box is close, but misses to the left following a corner.
Corner, Southampton. Conceded by Diego Poyet.
Foul by Dean Lewington (MK Dons).
Shane Long (Southampton) wins a free kick in the attacking half.
Corner, MK Dons. Conceded by Jose Fonte.
Substitution, Southampton. Maya Yoshida replaces Virgil van Dijk.
Goal! MK Dons 0, Southampton 6. Shane Long (Southampton) right footed shot from the centre of the box to the top right corner. Assisted by Steven Davis.
Attempt missed. Robert Hall (MK Dons) left footed shot from outside the box is close, but misses to the left.
Goal! MK Dons 0, Southampton 5. Shane Long (Southampton) with an attempt from very close range to the bottom right corner. Assisted by Juanmi.
Attempt missed. Shane Long (Southampton) right footed shot from outside the box is too high.
Substitution, Southampton. Gastón Ramírez replaces Sadio Mané.
Foul by Diego Poyet (MK Dons).
Juanmi (Southampton) wins a free kick on the right wing.
Daniel Powell (MK Dons) wins a free kick in the defensive half.
Foul by Oriol Romeu (Southampton).
Attempt saved. Sadio Mané (Southampton) left footed shot from outside the box is saved in the centre of the goal.
Substitution, MK Dons. Nicky Maynard replaces Simon Church.