A second Andretti Global driver has stepped to the fore, as Colton Herta led pre-qualifying practice for the Chevrolet Detroit Grand Prix presented by Lear on Saturday morning.

Herta produced the top lap of the one-hour session on the nine-turn, 1.645-mile downtown street circuit, 1 minute, 1.7823 seconds, in the No. 26 Gainbridge Honda. That’s just slightly slower than the top lap of the weekend turned Friday by his teammate Kyle Kirkwood, 1:01.7509, as air temperatures this morning hovered in the mid-50s under overcast skies.

SEE: Practice Results

Scott McLaughlin stayed in the No. 2 position for a second straight session in the No. 3 TireRack.com Team Penske Chevrolet with his top lap of 1:01.8995. Kirkwood stayed sharp, ending up third at 1:01.9423 in the No. 27 Siemens AWS Honda.

Callum Ilott brought PREMA Racing closer to the front of the NTT INDYCAR SERIES grid for the second straight weekend by ending up fourth at 1:02.1450 in the team’s No. 90 Chevrolet. Ilott’s rookie teammate, Robert Shwartzman, was the shock pole winner for the 109th Indianapolis 500 presented by Gainbridge.

Rookie Louis Foster, the 2024 INDY NXT by Firestone champion, enjoyed one of his strongest sessions of the season. He rounded out the top five at 1:02.1696 in the No. 45 Mi-Jack Honda of Rahal Letterman Lanigan Racing.

109th Indianapolis 500 presented by Gainbridge winner Alex Palou continued to struggle for the first time this season. Palou, who has won five of the first six races this season, managed to improve to 12th at 1:02.5318 in the No. 10 DHL Chip Ganassi Racing Honda after ending up 15th out of 27 drivers Friday.

Up next is NTT P1 Award qualifying at noon ET (FS1, FOX Sports app, INDYCAR Radio Network). The 100-lap race starts at 12:30 p.m. ET Sunday (FOX, FOX Sports app, INDYCAR Radio Network).