Andretti Autosport's American driver Marco Andretti (Front) races during the 2014 Honda Indy Toronto of IndyCar Series race in Toronto, Canada, July 19, 2014. The Indy car race was later cancelled due to rain on Saturday. (Xinhua/Zou Zheng)

Schmidt Peterson Hamilton Motorsports' French driver Simon Pagenaud (R) races during the 2014 Honda Indy Toronto of IndyCar Series race in Toronto, Canada, July 19, 2014. The Indy car race was later cancelled due to rain on Saturday. (Xinhua/Zou Zheng)

NTT Data Chip Ganassi Racing's Australian driver Ryan Briscoe (R) races during the 2014 Honda Indy Toronto of IndyCar Series race in Toronto, Canada, July 19, 2014. The Indy car race was later cancelled due to rain on Saturday. (Xinhua/Zou Zheng)

Chip Ganassi Racing Teams' American driver Charlie Kimball (R) races during the 2014 Honda Indy Toronto of IndyCar Series race in Toronto, Canada, July 19, 2014. The Indy car race was later cancelled due to rain on Saturday. (Xinhua/Zou Zheng)

KV AFS Racing's Colombian driver Sebastian Saavedra prepares to race during the 2014 Honda Indy Toronto of IndyCar Series race in Toronto, Canada, July 19, 2014. The Indy car race was later cancelled due to rain on Saturday. (Xinhua/Zou Zheng)

The crew members of Andretti-HVM take to change from dry to rain tires during the 2014 Honda Indy Toronto of IndyCar Series race in Toronto, Canada, July 19, 2014. The Indy car race was later cancelled due to rain on Saturday. (Xinhua/Zou Zheng)