Mario Kart 8 Deluxe released
Mario Kart 8 Deluxe launched worldwide for Nintendo Switch and became the console's best-selling game, carrying the series past 60 million copies on Switch alone.
Source: Nintendo — Mario Kart 8 Deluxe store page (release date April 28, 2017): https://www.nintendo.com/us/store/products/mario-kart-8-deluxe-switch/