Danica Patrick got loose in turn 4 on lap 150 while passing the lapped traffic of Jason Bowles but did a nice save with the spin to end up pointing back in the right direction. Other than Patrick - and Sadler, still seeking a late cure for his handling ills by taking on four new tyres - few cars came onto pit lane, preferring instead to maintain their track position for the restart despite some concerns about fuel should the race go into green-white-chequered overtime.
This time Keselowski couldn't run and hide at the green flag, and found himself bested by Kevin Harvick for the lead; behind them Hornish held onto third while Dillon again found himself temporarily shuffled back to fifth place, this time by Rickey Stenhouse Jr. with Kasey Kahne holding a watching brief in sixth.
With 22 laps to go, Harvick had built up a lead of almost a second and a half when he suddenly found himself boxed in among lapped traffic and stuck behind Amber Cope - running 33 laps down - leading to come minor contact that checked his momentum. Instantly Keselowski pounced, ripping through the gap that separated them and passing the #33 with ease before anyone knew quite what was happening.
Harvick was unable to come back on Keselowski in the final run to the chequered flag, but there was at least some consolation for Richard Childress Racing when Austin Dillon finally outmuscled Hornish for third place in the final half dozen laps. Harvick still made a point of lying in wait on the apron of the track for Amber Cope and giving the front of her car a swipe as the two entered pit lane, and continued to express his displeasure to pit lane reporters about drivers with no right to be allowed out racing.
"The #24, every time you'd come to her, she didn't know whether she was going high or low," he said. "It's not one of those deals. It's somebody who shouldn't be on the race track and has no clue what they're doing in a race car. She wants to be Danica Patrick, but she can't hold her helmet."
Elliott Sadler's final pit stop enabled him to recover six places and finish in seventh place by the end, enabling him to retain his points lead in the series standings. He's now just 3pts ahead of Austin Dillon, with Ricky Stenhouse Jr. a further 13pts back in third ahead of Sam Hornish Jr.
There was some minor drama once the cars parked in pit road, with Stenhouse climbing out of the #6 and promptly collapsing, a combination of the fierce afternoon heat and having already been sick as a dog all week with a bad case of strep throat. He quickly revived, but was placed on a stretcher as a safeguard. Watching on with concern, Kasey Kahne also looked distinctly unsteady for a moment, as much a sympathetic reaction as anything more serious than dehydration.
"I feel okay now," Stenhouse said after a trip to the infield care centre. "They gave me some fluids and got good to go. I think just being a little sick all week, not eating much and not drinking enough fluids caught up with me after the race ... My throat hurt throughout the whole week. I didn't really want to drink or eat anything and it caught up with me. Yesterday and today I drank plenty of fluids, but you've got to do it before, so I think we should be OK for Chicago."
Full race results as well as practice and qualifying times
and Nationwide Series points standings