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Johnson did not speak to reporters afterward. He was trying to become the first driver to reach four victories this season. Keselowski and Tony Stewart also have three, and drivers will earn bonus points in the Chase for “regular-season” victories.

It was Biffle’s second win of the year and third career victory at MIS. Keselowski, racing in his home state, settled for second place for the second straight week. He led before being passed convincingly by Johnson on lap 191 of 200.

“I didn’t know how much Jimmie had been holding back. When he pushed the trigger, when he passed me, it was clear he had been holding back a lot,” Keselowski said. “You never know how hard a driver is pushing. Obviously he wasn’t going a hundred percent. When he did, he was clearly the class of the field.”

But Johnson didn’t win. Instead, Biffle did for the 18th time on the Cup circuit.

Earnhardt won at MIS in June, snapping a four-year losing streak. The last driver to sweep the two Cup races at MIS was Labonte in 1995.

Stewart and Jeff Gordon both had motor problems, finishing 32nd and 28th. Gordon, Kyle Busch and Carl Edwards entered the race on the outside looking in for the Chase.

Those three didn’t do much to change that. Edwards finished sixth and Busch was 13th. There are three more races before the Chase starts.