Nishikori in his prime (whatever year you think that is; for me its 2014 or 2016) is going to play a best of 3 setter on hard court against the top 10 right now. How many does he beat?
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Fritz
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Hurkacz
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Rune
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Zverev
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Tsitsipas
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Rublev
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Sinner
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Medvedev
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Alcaraz
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Djokovic
The other time Nishikori beat Novak was in 2011 Basel, their h2h is 18-2.