Rahal Letterman Lanigan Racing’s Graham Rahal in the No.15 SoldierStrong/TurnsForTroops Honda led the way in the opening practice session at the Detroit Grand Prix on Belle Isle. Rahal set a fastest time of 01:15.3328s ending the session just ahead of Team Penske’s Helio Castroneves and Josef Newgarden.

Alexander Rossi was fourth fastest in the No.98 Honda just ahead of Team Penske’s Will Power in the No.12 Verizon Chevrolet.

Marco Andretti had a great session in the No.27 Magneti Marrelli Honda as he ended the session in sixth place just ahead of Scott Dixon in the No.9 Camping World Honda for Chip Ganassi Racing who spun the car but managed to keep it out of the wall ending the session just ahead of his team mate Tony Kanaan in the No.10 NTT DATA Honda.

Andretti Autosport’s Ryan Hunter Reay in the No.28 DHL Honda ended the session in ninth place while Schmidt Peterson Motorsports James Hinchcliffe in the No.5 Arrow Honda rounded out the top ten.

Defending IndyCar Series champion Simon Pagenaud was 11th for Team Penske just ahead of Indianapolis 500 winner Takuma Sato in the No.26 Honda for Andretti Autosport.

Mikhail Aleshin was 13th fastest in the No.7 SMP Racing Honda just ahead of JR Hildebrand in the No.21 Fuzzy’s Vodka Chevrolet for Ed Carpenter Racing. Chip Ganassi Racing’s Charlie Kimball in the No.83 Tresiba® Honda was 15th fastest just ahead of AJ Foyt Racing’s Carlos Munoz in the No.14 ABC Supply Co Chevrolet ending the sesson just ahead of Chip Ganassi Racing’s Max Chilton in the No.8 Gallagher Honda.

Conor Daly was 18th fastest in the No.4 ABC Supply Co Chevrolet for AJ Foyt Racing just ahead of Ed Carpenter Racing’s Spencer Pigot in the No.20 Fuzzy’s Vodka Chevrolet.

Oriol Servia was in 20th place for Rahal Letterman Lanigan Racing. Verizon IndyCar Series rookie Esteban Gutierrez in the No.18 Unifin Honda for Dale Coyne Racing completed 20 laps, the most of any driver in the session to end up in 21st place while his team mate Ed Jones rounded out the order in 22nd place.

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