The track was lost to rain in the final half hour of the two-hour session, at a point when Daly’s 222.714mph had put him top, ahead of the 221.296mph of teammate and team owner Ed Carpenter’s 221.296mph.
Their other teammate Rinus VeeKay suffered a nasty shunt at Turn 1 on his fifth lap that resulted in a broken finger.
Scott Dixon’s Chip Ganassi Racing-Honda was third ahead of the two Arrow McLaren SP-Chevys of Felix Rosenqvist and Pato O’Ward and a second Ganassi car, that of Alex Palou. O’Ward turned the most laps of the session at 23.
Colton Herta, Alexander Rossi (both Andretti Autosport-Honda) and Will Power (Team Penske-Chevrolet) were seventh, eighth and ninth respectively in the overall standings but 1-2-3 in the laps set without the aid of a tow, ranging from 219.8 – 219.6mph.
Twenty-one cars took part in the opening session which was for veterans only. The next two hours of on-track action will be reserved for Rookie Orientation Practice and Refreshers, but the scheduling is currently undecided due to the wet track.