Victor Franzoni topped the Indy Lights segment of the Mazda Road to Indy test at Road America this week.
The Brazilian, who has finished on the podium twice this year and is fourth in the standings, set a 1m52.7325s in the third of the four sessions for Juncos Racing.
Andretti Autosport’s Patricio O’Ward was second fastest, and the only other driver to break the 1m53s barrier.
Only seven drivers took past, with O’Ward’s team-mate Ryan Norman taking a close third from Belardi Auto Racing pair Santiago Urrutia and Aaron Telitz.
David Malukas topped the Pro Mazda test for BN Racing, and will be joined by a new team-mate for the two races this weekend.
BRDC British Formula 3 driver Toby Sowery is only confirmed at the team for one event so far, and is also racing in Italian Formula 4 with Monisha Kaltenborn’s KDC Racing team.
Rinus VeeKay went second fastest in the test for Juncos Racing, ahead of championship leader Parker Thompson (Exclusive Autosport), Andres Gutierrez (Team Pelfrey), Harrison Scott (RP Motorsport), Sting Ray Robb (Team Pelfrey) and Sowery.
Kaylen Frederick followed up his second place in the last race at Lucas Oil Raceway by topping the USF2000 part of the test.
He was 0.0793s faster than Lucas Kohl, who made it a Pabst Racing Services 1-2.
Championship leader Kyle Kirkwood was third for Cape Motorsports, with DEForce Racing driver Kory Enders and Pabst’s Calvin Ming completing the top five.