(to) go down to the wire
When a game, or more usually a league, has an exciting or tight finish. The result is not known until the very end.
- Example: The 2011-12 season in England went down to the wire as Manchester City won in the final minute of the last game of the season.
- Example: It looks like the relegation spots will not be decided until the final game of the season – it will go down to the wire.