The International Motor Sports Association (IMSA) is a North American sports car racing sanctioning body based in Daytona Beach, Florida, under the jurisdiction of the ACCUS arm of the FIA.

The first race to be organized by IMSA was a Formula Vee and Formula Ford event at Pocono Raceway in October 1969. The SCCA threatened the circuit management and asked them to block IMSA from racing there. The event was held, although IMSA had to pay an additional $10,000 in rental fees. The race had an attendance of 328 spectators.

The 2025 IMSA SportsCar Championship (known for sponsorship reasons as the 2025 IMSA WeatherTech SportsCar Championship) was a motor racing championship and the 55th racing season sanctioned by the International Motor Sports Association, which traced its lineage back to the 1971 IMSA GT Championship.

Porsche Penske Motorsport has now won all four of IMSA’s races this year with victory at Laguna Seca, lapping all but the two BMWs, and its lead car now has a 280-point lead before we’ve even reached pre-season.