Lots has been made of Southampton's start under Ronald Koeman. But the Saints have been taught a lesson in their own backyard.

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BBC Radio Manchester summariser Fred Eyre at St Mary's Stadium

"At half-time Ronald Koeman couldn't possibly have imagined this would end up as 3-0 defeat. Even Manchester City wouldn't have. But that is football for you, and City have players who can turn the game in your favour. All three goals were great goals. What must Frank Lampard have been like at his actual peak? He showed fantastic skill and composure to chest the ball down in his own penalty area and start the move for the third goal."

Terrific stuff from City. Had results gone their way, Chelsea could have been nine points clear tonight. Instead he gap is six points. And City are chasing hard.

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BBC Radio

"Manchester City have worked hard but tactically they also have got it spot on today. They've done their homework on Southampton," former Saints manager Dave Merrington on BBC Radio Solent.

Manuel Pellegrini looks a lot more relaxed. It's as though the City boss has forgotten that controversial penalty incident earlier.

Southampton look deflated. They are playing like the team down to 10 men. Three minutes of added time left.

The title race over? Don't you believe it. This has been impressive from Manchester City.

Thousands of empty seats now at St Mary's. Five minutes of added time.

12Laus: Again the James Milner-Frank Lampard combo. How many goals has that got for Man City this season?

Justin Lee: Oh dear Frank what have you done? You've put City only six points behind your team!

Prajjwal Panday: Lampard hunting down Chelsea. Never thought I'd say that.

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BBC Radio Manchester summariser Fred Eyre at St Mary's Stadium

"Gael Clichy ran 70 yards from his own penalty area as the ball travelled end to end via three players. A wonderful team goal from Manchester City."

What a time to score your first Manchester City goal. Gael Clichy can't believe it as Sergio Aguero's ball lands at his feet and the defender lashes home from eight yards.

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BBC Radio Manchester summariser Fred Eyre at St Mary's Stadium

"99 times out of 100 you would have put your mortgage on Sergio Aguero scoring but for once I wasn't confident on him scoring that one. He took it wide too late. Southampton are still coming forward but they have got a lot to do now against a City side that is really disciplined."

Five minutes to go and it's a thrilling finish at St Mary's. Shane Long drills the ball across the six-yard area but Graziano Pelle can't connect. The story of Southampton's day.

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Ten-man City are on the rampage. Sergio Aguero is clean through. Surely 3-0? Fraser Forster stands his ground and makes a vital save. Southampton have an extra man but they've gone to pieces.

BBC Radio Manchester summariser Fred Eyre at St Mary's Stadium

"Wonderful play from James Milner both in attack and defence. First to pounce on the ball with a rat-trap of a tackle, and then he takes it up the field before playing in Frank Lampard. He does what he has been doing since he was at least 14 years of age, scoring with a low drive from the edge of the area."

Down to 10 men...no problem. Game. Set. Match. Manchester City are going to end the day second after substitute Frank Lampard finds the net from the edge of the area. It's a fiercely struck low shot that leaves Saints keeper Fraser Forster rooted to the spot. He wasn't expecting that. And neither were Southampton's fans. It's all gone quiet.

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Nabil Hassan
BBC Sport at St Mary's Stadium

"Saints have been hanging on here and the frustration had been growing at St Mary's but Eliaquim Mangala's red card could be spark they need to get back into this game. Big 10 minutes coming up.

"'They've got to keep their heads, they can't be intimidated,' Dave Merrington tells BBC Radio Solent. 'Manchester City are going to put the shutters up now. Saints have got to gamble'."

Joey Knuff: Eliaquim Mangala, the biggest waste of money since Andy Carroll.

Harry Pannell: How can anyone justify Mangala being worth the same as Diego Costa? He's not worth £10m in my opinion.

Harry Siviter: Yaya Toure has gone from hero to villain. Sloppy in possession.

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Southampton scent blood. Manuel Pellegrini reacts to his side going down to 10 men by replacing Jesus Navas with defender Martín Demichelis, who might just have his work cut out in the remaining 12 minutes or so.

Spurs make three alterations from the side that started the win at Hull last week, with Vlad Chiriches, Nabil Bentaleb and Aaron Lennon returning.

Tottenham XI: Lloris; Chiriches, Fazio, Vertonghen, Davies; Lennon, Bentaleb, Mason, Eriksen; Kane, Soldado. Subs: Vorm, Dier, Kaboul, Chadli, Dembele, Lamela, Paulinho.