Tossup (noun)

A situation or contest that is uncertain or equally likely to be won by either side.

Origin:

It comes from the verb "toss" meaning "to throw something in the air with a quick movement".

Examples:

1. The game was a tossup and it could have gone either way.
2. The election was a tossup and it was too close to call.
3. The match was a tossup and it was difficult to predict the winner.
4. The final score was a tossup and it was a draw.
5. The competition was a tossup and it was anyone's game.