The session was red flagged with just 1min38sec left of the guaranteed 45min time, as Helio Castroneves spun his Meyer Shank Racing-Honda at Turn 13, just after setting his fastest lap of the morning.
When the session restarted, it looked unlikely that anyone could get their tires up to temperature soon enough to make a difference to the fastest times, but Chip Ganassi Racing-Honda pair Alex Palou and Marcus Ericsson strapped on new tires to suddenly burst into first and sixth respectively.
