Honda Indy Toronto organizers had begun discussions with Canadian Tire Motorsport Park about moving the IndyCar race to its permanent motorsports facility located north of Bowmanville, Ontario for one year in the event that a replacement date at Exhibition Place could not be found.[6][7][8] It would have been the first IndyCar race to have been held at the venue formerly known as Mosport since the 1978Molson Diamond Indy, won by Danny Ongais.[9]
An agreement was eventually made to host the race in June following the cancellation of the Grand Prix of Houston, with the Toronto Indy set to return to July for 2016.[10]
Two practice sessions were held on Friday June 12, with Juan Pablo Montoya posting the fastest time in both practice sessions.[12] An additional practice session was held the next morning with Hélio Castroneves posting the best time.[13]
Qualifying
23 cars entered for qualifications for the race.[14] The format was for "shootout" qualification rounds later on Saturday afternoon to determine pole position and the starting positions for the rest of the field. Will Power secured the pole position with teammates Simon Pagenaud and Montoya landing the second and third positions for Team Penske, with Scott Dixon taking fourth position, completing the second row for Chip Ganassi Racing.[15]
At the start of the race, the track was still wet from a large thunderstorm which had moved through the area just before the start. As a result, all the cars started out on wet tires. Pole driver Will Power held the lead for the first 30 laps, with Simon Pagenaud trying to overtake him several times, until he pitted under the first of the race's two full course cautions, which came out due to James Jakes having minor contact and stalling at Turn 5.[16] As Power pitted, the lead passed on to Penske teammate Hélio Castroneves. Castroneves held the lead until the second full course caution, when debris from Stefano Coletti's car was left on circuit at Turn 8. Josef Newgarden took the lead before it passed to CFH Racing teammate Luca Filippi on lap 58, before Tony Kanaan took the lead on lap 60. Three laps later, Castroneves re-took the lead which he held for four laps. After pitting, the lead fell to rookie Rodolfo González who held the lead for five laps as Newgarden and Filippi battled for second position. Gonzalez was ultimately forced to pit for fuel which handed the lead back to Newgarden. Newgarden held the lead until the checkered flag, to take his second victory of 2015. Filippi followed him home in second, to record CFH Racing's first 1–2 finish, with Castroneves taking third for Team Penske.
