IMSA GT3 Cup Challenge

The Porsche GT3 Cup Challenge USA by Yokohama is a one-make racing series based in North America using Porsche 911 GT3s.

IMSA GT3 Cup Challenge

Category	One-make racing by Porsche
Country	United States
Inaugural season	2005
Constructors	Porsche
Tyre suppliers	Yokohama
Drivers' champion	Roman De Angelis/Sebastian Carazo
Teams' champion	Kelly Moss / NGT Motorsport
Official website	porschegt3cupusa.imsa.com

Start of the 2006 race at Road Atlanta

The Porsche GT3 Cup Challenge USA by Yokohama entered its 15th season in 2019 and is the largest of Porsche's 20 single-make Cup Challenge series in the world. The series produces intense, exciting competition for semi-professional and aspiring professional drivers in the world's most produced and iconic race car, the Porsche 911 GT3 Cup.

Racing is divided into two classes – Platinum Cup, featuring the 2017-2019 Porsche 911 GT3 Cup car, which is based on the eighth (current) generation of the street car (991.2), and Gold Cup, featuring the 2014–2016 Porsche 911 GT3 Cup car, which is based on the seventh generation of the street car (991.1). A Masters Championship also is conducted in Platinum class, this class consists of drivers 45 years of age or older. Each class is awarded with its own podium at the end of every race and individual champion at the end of every season. Points are awarded by finish in class.

The series is sanctioned by the International Motor Sports Association, and is a support series to the WeatherTech SportsCar Championship.