Andretti leads opening Iowa session

Marco Andretti topped the opening practice session for this weekend's IndyCar Series race at Iowa Speedway. Andretti, who won last year's race at the 7/8th mile oval, set the pace with a best lap of 184.832mph to finish up just ahead of Sarah Fisher Hartman's Josef Newgarden and Bryan Herta Autosport's Alex Tagliani. Ryan Briscoe (Penske) and Scott Dixon (Ganassi) completed the top five

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