How to counter Yasuo. Pls help

I have a friends that mains adc and doesn't know what to do against a Yasuo. He says Yasuo is cancer and doesn't seem to find anything that can help him. He is more worried about the Mid/Late game part of Yasuo not so much the lanning phase. As a Riven main i find it easy to beat a Yasuo but he seems to find that i am baised as i don't play/main adc. Any suggestion from high elo players?
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