I'm not a sports buff so I can't think of anyone who comes close in the US for that... In entertainment world I think Thriller-era Michael Jackson is a good comparison. Very close to Beatlemania but even closer to Yuzuru in that he was first known as a child prodigy before developing into a respected & successful performer his field... High expectations were placed on them but they both went beyond the beyond, breaking records and dazzling basically the whole world with star power, grace and excellence. I was crazy about MJ when I was a kid, I remember seeing & hearing him everywhere, crossing all demographics, seemed like it would never end and he was almost magical.