It's been a busy week for Chastain.
He stayed in Las Vegas Sunday night to attend Monday's Academy of Country Music Awards (ACMs) at Allegiant Stadium.
Chastain is familiar with Phoenix. Sunday marks his eighth Cup start on the mile oval where he owns a best finish of 14th in NASCAR's premiere series. In the Xfinity Series at Phoenix, Chastain has 11 starts with a best finish of seventh along with 14 laps led.
Fox will broadcast Sunday's 400-mile race at 3:30 p.m. ET.