Match ends, Portsmouth 0, Southampton 4.
Southampton boss Ralph Hasenhuttl says he will never forget beating Portsmouth as the Premier League side beat their local rivals 4-0 to reach the last 16 of the Carabao Cup.
Danny Ings scored twice while there were also goals for Cedric Soares and Nathan Redmond.
This was the first south coast derby in seven years and Southampton's first win at Fratton Park since 1984.
"This is more than only reaching the next round," said Hasenhuttl.
"This is about reaching the hearts of the fans. I am very happy for them.
"I knew it was a massive game for them and I think we really didn't start well in this game, but the players knew they had to fight for every inch."
The hosts were ultimately well beaten, but were unlucky not to have taken the lead after a high-tempo start.
- Fan punches horse in south coast derby
- Relive all the action from the Carabao Cup third round
- Football Daily podcast: Spurs crash out Carabao Cup as Man City march on
John Marquis powered a shot just wide of the post for Portsmouth early on before Alex McCarthy tipped over Brett Pitman's effort fierce drive.
However, Ings' first-half double knocked their enthusiasm and they barely troubled their regional rivals in a second half the visitors completely dominated.
"I have never had such an atmosphere in a stadium so far," added Hasenhuttl.
"I was hoping it is coming in a way that you can also celebrate the football and if you see such a game here then you know why football is so popular in England."
The win will have been a welcome boost for Hasenhuttl after the Saints lost 3-1 at home to Bournemouth in the Premier League last Friday.
Portsmouth, meanwhile, switch focus back to trying to find their form in League One, Kenny Jackett's side without a league win since 10 August.
"We had a lot of pressure, a lot of chances, opportunities, one on ones and set pieces but we didn't take them," said Jackett.
"We went two up front and tried to bring the crowd into play and they were fantastic.
"As a manager, I didn't want to come away not having a go tonight, and just shutting up shop."
- 9HawkinsBooked at 53minsSubstituted forDowningat 59'minutes
- 33CloseSubstituted forMcCrorieat 82'minutes
- 7WilliamsSubstituted forEvansat 78'minutes
- 8PitmanBooked at 55mins
- 2Cédric Soares
- 21BertrandBooked at 66mins
- 20ObafemiSubstituted forRedmondat 72'minutes
- 9IngsSubstituted forLongat 83'minutes
- Kevin Friend
- Shots on Target
Second Half ends, Portsmouth 0, Southampton 4.
Offside, Southampton. Oriol Romeu tries a through ball, but Che Adams is caught offside.
Oriol Romeu (Southampton) wins a free kick in the attacking half.
Foul by Christian Burgess (Portsmouth).
Hand ball by Pierre-Emile Højbjerg (Southampton).
Goal! Portsmouth 0, Southampton 4. Nathan Redmond (Southampton) right footed shot from outside the box to the bottom left corner. Assisted by Jan Bednarek.
Attempt saved. Shane Long (Southampton) right footed shot from outside the box is saved in the centre of the goal. Assisted by Nathan Redmond.
Foul by Shane Long (Southampton).
Craig MacGillivray (Portsmouth) wins a free kick in the defensive half.
Substitution, Southampton. Shane Long replaces Danny Ings.
Substitution, Portsmouth. Ross McCrorie replaces Ben Close.
Danny Ings (Southampton) wins a free kick in the attacking half.
Foul by Gareth Evans (Portsmouth).
Substitution, Portsmouth. Gareth Evans replaces Ryan Williams.
Goal! Portsmouth 0, Southampton 3. Cédric Soares (Southampton) right footed shot from the centre of the box to the bottom left corner.
Corner, Portsmouth. Conceded by Cédric Soares.
Attempt blocked. Ronan Curtis (Portsmouth) right footed shot from the centre of the box is blocked. Assisted by Brett Pitman.
Foul by Pierre-Emile Højbjerg (Southampton).
Ryan Williams (Portsmouth) wins a free kick in the defensive half.