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The 2021 IMSA SportsCar Championship (known for sponsorship reasons as the 2021 IMSA WeatherTech SportsCar Championship) was the 51st racing season sanctioned by the International Motor Sports Association (IMSA) which traces its lineage back to the 1971 IMSA GT Championship. This was also the eighth United SportsCar Championship season and sixth under the IMSA SportsCar Championship name. The series began on January 30 with the 24 Hours of Daytona, and ended on November 13 with the Petit Le Mans after 12 races.