The correct form of verb to be used here is (D)Good.
Explanation:
Verbs has its different forms. The different forms of the verb 'GOOD' is Good, better and best.
According to the sentence, the word to be used here is 'Good'.
Therefore, the correct sentence will be-
He is the best tennis player in the world. No other tennis player is as good as him.
Learn more about Verbs on https://brainly.com/question/13956220
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