The 1958 United States Grand Prix for Sports Cars was a sports car race held at Riverside International Raceway on October 12, 1958. It was the fourth and final round of the 1958 USAC Road Racing Championship season, the seventeenth round of the Sports Car Club of America's Pacific Coast Championship, the second running of the Riverside Grand Prix, and the first post-World War II running of the United States Grand Prix. The race was held over 62 laps of Riverside's 3.3-mile (5.3 km) circuit, for a total of 203.1 miles (326.9 km). Chuck Daigh won the race overall, driving one of Lance Reventlow's Scarab-Chevrolets. The race is also noteworthy in the annals of international racing, as the strong second-place finish by a local driver named Dan Gurney earned him a test drive in a factory Ferra