The Texas Motor Speedway IndyCar race has been delayed until Sunday after heavy rain showers earlier on Saturday.
The event was due to start under floodlights at 8.45pm local time, but the wet weather meant the green flag was pushed back due to track drying.
Though no further rain fell in the evening, humid conditions hampered efforts to dry the remaining damp patches.
Two hours and 45 minutes after the race was originally set to begin, IndyCar officials announced the Firestone 600 had been postponed to Sunday at 1.15pm local time.
During Friday's qualifying session, Andretti Autosport driver Carlos Munoz secured his first ever IndyCar pole position with a two-lap average of 217.137mph.
He will start the rescheduled race, round nine of the 2016 IndyCar season, from the front of the field, ahead of Chip Ganassi Racing's Scott Dixon.
Four-time Texas race winner Helio Castroneves will line up in third place, sharing the second row with Takuma Sato.