ALEXANDER ROSSI, 26
A former F1 driver from Nevada City, Calif., he took the 100th Indy 500, in 2016, for Andretti Autosport, becoming the first U.S. rookie to win since 1928.
GRAHAM RAHAL, 28
The son of 1986 Indy 500 champ Bobby Rahal was the youngest winner in IndyCar history (in 2008, St. Petersburg, at 19), the first of his six career victories.
ZACH VEACH, 22
After finishing fourth in Indy Lights in 2016, with three victories, he made his IndyCar debut last April at the Indy 500 and will race a full season for Andretti Autosport.
SPENCER PIGOT, 24
The winningest driver in Mazda Road to Indy history—24 victories across three circuits—has signed with Ed Carpenter Racing for the 2018 IndyCar season.