We have already seen the first week sales result for Japan, but both NoA and NoE are confirming this now via Twitter:
Update: from the press release from NoA
Update: from the press release from NoA
REDMOND, Wash., Nov. 2, 2017 – In just five days, the new Super Mario Odyssey video game for the Nintendo Switch system sold more than 1.1 million units in the U.S. alone. That makes it the fastest-selling Super Mario game ever in the U.S., surpassing the New Super Mario Bros. Wii game. Super Mario Odyssey is also the fastest-selling game so far for Nintendo Switch.