Hits the highest score (3,6)

I believe the answer is:

top twenty

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'hits' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'highest score' is the wordplay.
'highest' becomes 'top' (at the top).
'score' becomes 'twenty' (synonyms).
'top'+'twenty'='TOP TWENTY'

'the' acts as a link.

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