The NPD Group (via a Nintendo press release) has declared that through its first 21 months on sale in the U.S., Nintendo’s Switch console is the fastest-selling system of this generation when compared to the other consoles over the same period.
From March 2017 to November 2018 the Switch sold more than 8.7 million units.
Nintendo has also announced that Super Smash Bros. Ultimate is the fastest-selling Switch title of all time – as well as for the series as a whole – and has sold over three million units in its first 11 days.
[Source: Nintendo]