In 1990, following a superb debut race, the GTO class RX-7s took second place again in the following round in Miami, and third place in the Sebring 12-hours. The RX-7 remained one step away from victory with yet another second at the fourth round in Long Beach. Finally, at the raceway in Topeka, Kansas, the long-sought after first victory was secured, and Mazda followed it up with another win in the sixth race at the Mid-Ohio Sports Car Course.
At the 11th race in San Antonio, Texas, Pete Halsmer started from the outside lane of the front row. After a fierce battle with a Mercury Cougar, he claimed the RX-7's 100th IMSA victory. It was an unprecedented feat accomplished in just 12 years of IMSA competition that had started at the 1979 Daytona 24-hour race.