Raphael Matos set the fastest time on the practice day for the IndyCar Series' Toronto debut - despite ending the afternoon stranded in the middle of the pits straight after crashing at the final corner.
Luczo Dragon's Brazilian rookie spun and tagged the wall with two minutes of afternoon practice to go, ending the session early and cementing his place at the top of the timesheets.
Matos had been a leading factor throughout the day, having taken second to Will Power (Penske) in the morning.
Power was third this afternoon, just behind Watkins Glen winner Justin Wilson, who moved back into contention for Dale Coyne Racing after a quiet opening practice session.
Robert Doornbos took fourth for Newman/Haas/Lanigan, benefiting from having raced at the track during his Champ Car season.
The often dominant Penske and Ganassi quartet filled fifth to ninth places, ahead of Tony Kanaan (Andretti Green).
Penske's Helio Castroneves was one of several drivers to run into problems in the session, parking early after breaking his suspension against the Turn 5 wall.
Danica Patrick (AGR) had earlier hit trouble at the same place - spinning on the exit of the corner and sliding broadside into the barriers at Turn 6, bending her car's left side suspension and ending her afternoon. Her team-mate Marco Andretti had a less damaging incident, lightly tagging the wall when he spun under braking for Turn 1.
After his top five run in the morning, local hero Paul Tracy had to settle for 13th this time, having had a spin on the exit of Turn 1 along the way.
Rain is forecast for tomorrow, when there is one more free practice session prior to qualifying.
Pos Driver Team Time Gap 1. Raphael Matos Luczo Dragon 1m01.4739s 2. Justin Wilson Coyne 1m01.7627s + 0.2888s 3. Will Power Penske 1m01.7722s + 0.2983s 4. Robert Doornbos Newman/Haas/Lanigan 1m01.8386s + 0.3647s 5. Ryan Briscoe Penske 1m01.8420s + 0.3681s 6. Dario Franchitti Ganassi 1m01.9237s + 0.4498s 7. Helio Castroneves Penske 1m01.9364s + 0.4625s 8. Scott Dixon Ganassi 1m01.9617s + 0.4878s 9. Graham Rahal Newman/Haas/Lanigan 1m02.0027s + 0.5288s 10. Tony Kanaan Andretti Green 1m02.0044s + 0.5305s 11. Mike Conway Dreyer & Reinbold 1m02.1916s + 0.7177s 12. Tomas Scheckter Dreyer & Reinbold 1m02.3048s + 0.8309s 13. Paul Tracy KV 1m02.3653s + 0.8914s 14. Ryan Hunter-Reay Foyt 1m02.4745s + 1.0006s 15. Marco Andretti Andretti Green 1m02.5434s + 1.0695s 16. Mario Moraes KV 1m02.6133s + 1.1394s 17. Alex Tagliani Conquest 1m02.7255s + 1.2516s 18. Ernesto Viso HVM 1m02.7758s + 1.3019s 19. Dan Wheldon Panther 1m03.4514s + 1.9775s 20. Richard Antinucci 3G 1m03.9239s + 2.4500s 21. Danica Patrick Andretti Green 1m03.9279s + 2.4540s 22. Hideki Mutoh Andretti Green 1m03.9653s + 2.4914s 23. Ed Carpenter Vision 1m04.7355s + 3.2616s