Scott Dixon took the lead by passing Will Power in pit row on the 57th lap and then held on Sunday to capture his fourth IndyCar title in the last six years at Mid-Ohio.
Dixon, who previously won titles on the winding road course in 2007, '09 and '11, qualified fourth and patiently picked off cars until he sped past Power when both pitted just past the midpoint of the 85-lap race.
Power, who ended up second, took over the points lead from Ryan Hunter-Reay, who finished 24th.
Rookie Simon Pagenaud hung on for third place.
There were no caution flags for the second IndyCar race in a row, the first time that's happened since 1987. The race was contested under cloudy skies and in cool temperatures.
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