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 tell whether it can be defined by this definition.

'the highest score' is the wordplay.
'the highest' becomes 'top' (I've seen this before).
'score' becomes 'twenty' (synonyms).
'top'+'twenty'='TOP TWENTY'

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