Tristan Vautier topped the times in the second practice session for this weekend's IndyCar race around the streets of Baltimore.
The Schmidt rookie went to the top mid-way through the session with a 1m19.4792s effort and the time stood right up until Will Power brought things to an end with a trip into the Turn 9 tyres with a few seconds remaining on the clock.
A string of interruptions prevented some drivers from being able to run a final set of new tyres, with Justin Wilson bringing out the reds with a spin at Turn 3, and an earlier stoppage being called after contact in the chicane left a chunk of Oriol Servia's wing on the track.
Graham Rahal, who had earlier led times, finished up second-fastest for Rahal Letterman Lanigan with a lap 0.08s slower than Vautier's, with Josef Newgarden - another early leader - third-quickest in the Sarah Fisher Hartman car.
Most of the action during the afternoon took place around the chicane, where James Hinchcliffe was lucky to escape damage after clipping the tyre stack hard on the entry.
Shortly afterwards, Sebastian Saavedra did it properly, bouncing off the tyres in the middle of the chicane and then hitting the tyre stack at the exit head-on, forcing the Colombian into the pits for a new front wing.
Pos Driver Team/Engine Time Gap 1. Tristan Vautier Schmidt/Honda 1m19.4792s 2. Graham Rahal Rahal/Honda 1m19.5630s +0.0838s 3. Josef Newgarden Fisher/Honda 1m19.6662s +0.1870s 4. Scott Dixon Ganassi/Honda 1m19.7027s +0.2235s 5. Simon Pagenaud Schmidt/Honda 1m19.8509s +0.3717s 6. Will Power Penske/Chevy 1m19.8756s +0.3964s 7. Tony Kanaan KV/Chevy 1m20.0593s +0.5801s 8. Takuma Sato Foyt/Honda 1m20.0934s +0.6142s 9. Sebastien Bourdais Dragon/Chevy 1m20.1604s +0.6812s 10. Dario Franchitti Ganassi/Honda 1m20.1976s +0.7184s 11. Luca Filippi Herta/Honda 1m20.2042s +0.7250s 12. Oriol Servia Panther/Chevy 1m20.3953s +0.9161s 13. Helio Castroneves Penske/Chevy 1m20.4774s +0.9982s 14. James Hinchcliffe Andretti/Chevy 1m20.5546s +1.0754s 15. EJ Viso Andretti/Chevy 1m20.6001s +1.1209s 16. Ryan Hunter-Reay Andretti/Chevy 1m20.6077s +1.1285s 17. Justin Wilson Coyne/Honda 1m20.7808s +1.3016s 18. Sebastian Saavedra Dragon/Chevy 1m20.8272s +1.3480s 19. Charlie Kimball Ganassi/Honda 1m20.8984s +1.4192s 20. James Jakes Rahal/Honda 1m20.9139s +1.4347s 21. Marco Andretti Andretti/Chevy 1m21.0618s +1.5826s 22. Simona de Silvestro KV/Chevy 1m21.7958s +2.3166s 23. Ed Carpenter Carpenter/Chevy 1m22.4532s +2.9740s 24. Stefan Wilson Coyne/Honda 1m23.6238s +4.1446s All drivers use Dallara DW12 chassis