Best US debuts

Amir Khans win got me thinking

what fighters had the most impressive US debuts. His was pretty impressive but I wonder where it stands as all time great US debuts.

Doesnt matter from what time frame they come frome. I dont mean guys that had 1 little fight then a big US fight. Im talking never set foot in a ring in the US until their impressive win.

only have 68 words need 75. i should be good now

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