Sentence improvement: verify the superlative noun phrase is already correct Original sentence: "They have a scheme of rewarding the best of the performers every year." Decide whether any correction is required.

Why the original works
The partitive construction "the best of the performers" is grammatical and idiomatic, referring to the single top performer from the set of "the performers".

Option analysis (errors)
a best performer — article "a" clashes with superlative "best".the best among the performer — number mismatch (singular "performer" with "among").a best among performer — malformed noun phrase.the best of the performer — singular head after "of" is wrong.

Final Answer
No correction required.