Scott Dixon finished top of the timesheets in the Sunday morning warm-up practice, his laptime of 50.9117s (105.455mph) a slender 0.0073s faster than Simon Pagenaud in second place. In all, the top 18 cars all ran within one second of each other on the 1.75-mile, 11-turn Toronto street circuit.

Ryan Hunter-Reay took to the run-off in turn 3 early in the session after making contact with the rear of Will Power's car. Hunter-Reay was able to keep the engine running and get back underway without bringing out the red flags, but had some right-front damage for the pit crew to attend to; Penske needed to check damage to Power's rear wing assembly.

After that the session looked set to run without any red flags, but a late incident for Simona de Silvestro saw the HVM hit an object - apparently a tyre dislodged from the tyre barrier - and ended up in the wall with left-side damage at turn 2. That caused a lengthy red flag stoppage and allowed the cars only a very short reprise out on track before the chequered flag came out.

De Silvestro is one of three drivers already served with a ten-place grid penalty for engine changes, along with the two Canadian drivers Alex Tagliani and James Hinchcliffe. A fourth driver - Dale Coyne Racing's James Jakes - was added to that list after needing to replace his engine overnight.

The race is due to start at 1pm local time, 6pm BST.

Sunday warm-up times

1. #9 Scott Dixon (H) 105.455mph 59.9117s(20 laps)
2. #77 Simon Pagenaud (H) 105.442mph 59.9190s + 0.0073s (16 laps)
3. #14 Mike Conway (H) 105.358mph 59.9670s + 0.0553s (17 laps)
4. #28 Ryan Hunter-Reay (C) 105.353mph 59.9699s + 0.0582s (15 laps)
5. #83 Charlie Kimball (H) 105.192mph 1m 00.0617s + 0.1500s (17 laps)
6. #18 Justin Wilson (H) 105.158mph 1m 00.0811s + 0.1694s (19 laps)
7. #67 Josef Newgarden (H) 104.875mph 1m 00.2432s + 0.3315s (17 laps)
8. #98 Alex Tagliani (H) 104.812mph 1m 00.2796s + 0.3679s (16 laps)
9. #38 Graham Rahal (H) 104.759mph 1m 00.3097s + 0.3980s (19 laps)
10. #3 Helio Castroneves (C) 104.669mph 1m 00.3615s + 0.4498s (24 laps)
11. #12 Will Power (C) 104.405mph 1m 00.5144s + 0.6027s (20 laps)
12. #7 Sebastien Bourdais (C) 104.393mph 1m 00.5213s + 0.6096s (20 laps)
13. #2 Ryan Briscoe (C) 104.375mph 1m 00.5316s + 0.6199s (16 laps)
14. #22 Oriol Servia (C) 104.363mph 1m 00.5389s + 0.6272s (17 laps)
15. #10 Dario Franchitti (H) 104.191mph 1m 00.6384s + 0.7267s (18 laps)
16. #19 James Jakes (H) 104.186mph 1m 00.6418s + 0.7301s (20 laps)
17. #11 Tony Kanaan (C) 104.038mph 1m 00.7279s + 0.8162s (18 laps)
18. #5 EJ Viso (C) 103.939mph 1m 00.7858s + 0.8741s (18 laps)
19. #15 Takuma Sato (H) 103.646mph 1m 00.9577s + 1.0460s (20 laps)
20. #27 James Hinchcliffe (C) 103.624mph 1m 00.9705s + 1.0588s (16 laps)
21. #4 JR Hildebrand (C) 103.601mph 1m 00.9840s + 1.0723s (20 laps)
22. #26 Marco Andretti (C) 103.281mph 1m 01.1732s + 1.2615s (16 laps)
23. #78 Simona de Silvestro (L) 103.142mph 1m 01.2553s + 1.3436s (14 laps)
24. #8 Rubens Barrichello (C) 102.991mph 1m 01.3452s + 1.4335s (16 laps)
25. #20 Ed Carpenter (C) 101.877mph 1m 02.0157s + 2.1040s (14 laps)

Total Laps: 443