 Complete the following phrase:  Andretti joined the PPG Indy Car World Series CART in 1987, winning the Rookie of the Year award. In his debut at the Indianapolis Motor Speedway in 1988, he reached as high as seventh place before mechanical problems forced him to finish 21st. In 1991 he won the only race of his CART career, the Gold Coast Grand Prix in Surfers Paradise, Australia. He finished a career-best fifth in the 