Achieve victory in more evenly contested baseball event (3-7)

'baseball event' is the definition.
The definition suggests a singular noun which matches the answer.

'achieve victory in more evenly contested' is the wordplay.
I cannot really see how this works, but
'achieve' could be 'win' (I've seen this in another clue) and 'win' is present in the answer.
'evenly contested' could be 'tight' (I've seen this in another clue) and 'tight' is found in the leftover letters.
The remaining letters 'er' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?