Sato lapped the course in 58.6777sec, an average of 109.551mph to edge Josef Newgarden’s Penske-Chevrolet by just a tenth of a second. That's an (unofficial) track record for this course layout.

Newgarden might have improved on that time with his final lap but ended the session in a tire wall, where rookie Robert Wickens had also just parked his Schmidt Peterson Motorsports-Honda.

Will Power at last found a turn of speed to go P3, one-tenth behind Newgarden, with Alexander Rossi fourth just a couple of hundredths down in the first of the Andretti Autosport-Hondas.

Spencer Pigot was an impressive fifth for Ed Carpenter Racing, beating yesterday’s pacesetter Scott Dixon who made a brief visit to an escape road.

Wickens grabbed P7 on his last lap before his session-ending incident.

Conor Daly, making his return to the series in a one-off with Harding Racing, was P20, 1.1sec from top spot.

Toronto, IndyCar third practice

Cla	#	Driver	Laps	Time	Gap	Interval	Mph
1	30	Takuma Sato	22	58.6777			109.551
2	1	Josef Newgarden	20	58.7750	0.0973	0.0973	109.369
3	12	Will Power	20	58.8758	0.1981	0.1008	109.182
4	27	Alexander Rossi	21	58.8997	0.2220	0.0239	109.138
5	21	Spencer Pigot	20	58.9529	0.2752	0.0532	109.039
6	9	Scott Dixon	22	58.9569	0.2792	0.0040	109.032
7	6	Robert Wickens	21	59.0128	0.3351	0.0559	108.929
8	15	Graham Rahal	20	59.0157	0.3380	0.0029	108.923
9	28	Ryan Hunter-Reay	21	59.0366	0.3589	0.0209	108.885
10	10	Ed Jones	24	59.1202	0.4425	0.0836	108.731
11	98	Marco Andretti	21	59.2087	0.5310	0.0885	108.568
12	18	Sébastien Bourdais	21	59.2292	0.5515	0.0205	108.531
13	22	Simon Pagenaud	23	59.3004	0.6227	0.0712	108.400
14	5	James Hinchcliffe	22	59.3569	0.6792	0.0565	108.297
15	26	Zach Veach	22	59.5250	0.8473	0.1681	107.991
16	14	Tony Kanaan	22	59.5387	0.8610	0.0137	107.966
17	59	Max Chilton	23	59.6743	0.9966	0.1356	107.721
18	20	Jordan King	21	59.6805	1.0028	0.0062	107.710
19	4	Matheus Leist	24	59.7405	1.0628	0.0600	107.602
20	88	Conor Daly	18	59.7835	1.1058	0.0430	107.524
21	19	Zachary Claman De Melo	22	59.9181	1.2404	0.1346	107.283
22	32	Rene Binder	27	59.9938	1.3161	0.0757	107.147
23	23	Charlie Kimball	18	1'00.0148	1.3371	0.0210	107.110