Tony Kanaan set the pace in the opening session for this weekend's IndyCar race at Iowa Speedway.
The Indianapolis 500 winner moved to the top with a 184.063mph lap for KV just under five minutes before the session ended, beating the previous benchmark of 183.100mph that had been set by Marco Andretti.
For most of the session, Andretti's time looked untouchable, and it was over an hour before anybody else even broke into the 181mph range.
But times fell quickly over the last few minutes, and Will Power was able to leapfrog the Andretti driver in the final moments to go second-fastest for Penske.
Saturday morning's outing was the only practice session of the weekend due to Iowa's unique qualifying system, which starts with a single flying-lap format before leading into three evening heat races, the outcome of which will be used to decide the grid for Sunday's race.
Pos Driver Team/Engine Time Gap
1. Tony Kanaan KV/Chevy 17.4853s
2. Will Power Penske/Chevy 17.5292s +0.0439s
3. Marco Andretti Andretti/Chevy 17.5773s +0.0920s
4. Helio Castroneves Penske/Chevy 17.5905s +0.1052s
5. Scott Dixon Ganassi/Honda 17.6022s +0.1169s
6. EJ Viso Andretti/Chevy 17.6705s +0.1852s
7. James Hinchcliffe Andretti/Chevy 17.7102s +0.2249s
8. James Jakes Coyne/Honda 17.7264s +0.2411s
9. Ed Carpenter Carpenter/Chevy 17.7588s +0.2735s
10. Simon Pagenaud Schmidt/Honda 17.8281s +0.3428s
11. Sebastien Bourdais Dragon/Chevy 17.8318s +0.3465s
12. Alex Tagliani Herta/Honda 17.8466s +0.3613s
13. Ryan Hunter-Reay Andretti/Chevy 17.8534s +0.3681s
14. Tristan Vautier Schmidt/Honda 17.8607s +0.3754s
15. Josef Newgarden Fisher/Honda 17.8615s +0.3762s
16. Dario Franchitti Ganassi/Honda 17.8915s +0.4062s
17. Graham Rahal Rahal/Honda 17.9415s +0.4562s
18. Oriol Servia Panther/Chevy 17.9674s +0.4821s
19. Takuma Sato Foyt/Honda 18.0014s +0.5161s
20. Justin Wilson Coyne/Honda 18.0896s +0.6043s
21. Charlie Kimball Ganassi/Honda 18.0938s +0.6085s
22. Simona de Silvestro KV/Chevy 18.2341s +0.7488s
23. Sebastian Saavedra Dragon/Chevy 18.2621s +0.7768s
24. Ana Beatriz Coyne/Honda 18.3702s +0.8849s
All drivers in Dallara DW12 chassis