head-to-head
US /ˌhed.təˈhed/
UK /ˌhed.təˈhed/

1.
involving two competitors or groups directly opposing each other
:
•
The two candidates are in a head-to-head battle for the presidency.
•
They will compete head-to-head in the final round.
1.
in direct opposition or competition
:
•
The two teams went head-to-head in the championship game.
•
They debated head-to-head on the controversial issue.