Birmingham MPs Steve McCabe and Lynne Jones are to fight it out for the right to be a Labour candidate at the next General Election.
Mr McCabe, currently the MP for Hall Green, has applied to be the party candidate in Selly Oak, currently represented by Dr Jones.
He has decided not to stand in Hall Green again after the constituency's boundaries were re-drawn.
But Dr Jones hopes to hang on to her constituency and local party members will have to choose between them.
At the same time, she has also applied for Hall Green, saying it would be her second choice if she fails to win the nomination for Selly Oak.
But she would face competition again – this time from Roger Godsiff, currently the MP for Sparkbrook and Small Heath.
Mr Godsiff has applied for the Hall Green seat after his own constituency was abolished.
The number of Birmingham seats in the Commons is to be reduced from 11 to ten because of a falling population.
Although the new Hall Green and Selly Oak seats have the same names as existing constituencies, their borders are very different.
For example, the new Selly Oak will include the wards of Brandwood and Billesley, which are currently part of Hall Green.
Mr McCabe said this was why he had decided to apply for the Selly Oak seat.