Wimbledon is set to remain as one constituency following the latest proposals from the Boundary Commission for England.
Other constituencies in south west London are set to be divided, with the South Thames area due to have the number of constituencies reduced from 28 to 26.
Wimbledon MP Stephen Hammond praised the work of his constituents who vocally opposed the changes.
He said: “This is a spectacular effort from the people of Wimbledon who made it very clear for the second time how cohesive our community is.
“Wimbledon Park and Wimbledon Village are integral parts of the community and residents have shown strength in our submissions.”
Though there was deliberation of where Belmont would go, the Commission have decided to add it to Tom Brake’s constituency of Carshalton & Wallington, since it provides for a constituency wholly within the Sutton borough.
Casting doubt on the entire process, Mr Brake said: “The real question is whether this change will happen at all, as it is questionable whether the Government will be able to command a majority.
“The DUP, on whom they rely for their majority, are unlikely to support plans which would cut the number of DUP seats and increase those for Sinn Fein.”
Despite the success in Wimbledon, Croydon was not as fortunate, and the new plans would see the newly- won Labour seat turn into three constituencies.
Under the proposals, Croydon North will be replaced with Norwood and Thornton Heath.
The London Road area will be separated from the rest of Croydon, as three constituencies will be combined in to a new seat named Mitcham and Norbury.
And the strong Labour seat in Woodside ward, in Croydon central would be moved to the Norwood and Thornton seat.
A Merton Council spokesperson said: “We strongly urged the Boundary Commission to reassess their initial proposals, which we felt would have had a negative impact on the residents of Merton in terms of representation and partnership working and on the local communities that make up the borough.”
The commission’s proposals come after an independent decision to decrease the number of MPs from 650 to 600 in an attempt to save up to £50m over five years.
The commission are running consultations until December 11, and residents are invited to have their say at www.bce2018.org.uk.