HAMPTON, Ga. — One by one, Jimmie Johnson picked off all the drivers ahead of him.

By the end, he was the guy everyone was chasing.

Good luck with that.

The six-time NASCAR Sprint Cup is already taking aim at No. 7.

With a performance that all but locked up his spot in the championship Chase, Johnson didn’t even wait for the calendar to flip to spring to show that he’ll be awfully tough to beat.

After starting near the back of the field because he didn’t get a chance to qualify, Johnson pulled away after the final restart with 13 laps remaining to win Sunday at Atlanta Motor Speedway. He beat Kevin Harvick by nearly 2 seconds.

“When he’s on, really switched on, and the car’s in his comfort zone, it’s amazing what he can do with a race car,” said Chad Knaus, Johnson’s longtime crew chief.

Johnson is the only driver to make the Chase through each of its first 11 years, but he’s coming off an 11th-place finish in 2014 — the first time he’s ever placed lower than sixth over a full season.

Some wondered, at age 39, if that signaled the beginning of a decline.

Not so fast.

“It takes the pressure off in some ways,” said Johnson, who didn’t pick up his first of his four victories a year ago until the 12th race.

He heads to Las Vegas next weekend knowing he remains the king of the mile-and-a-half tracks, like the one in Atlanta and the one he’ll be racing on in Sin City. In some ways, this was the start of the real season, competing under the rules and on the style of track that will make up most of the 36-race schedule.

“I definitely think it gives you a sign of who’s going to be competitive,” Johnson said. “I feel really good coming here and having this kind of showing. What we did here, we can take to a lot of the racetracks ahead.”

While Johnson shined, NASCAR faced more questions about its safety procedures.

A week ago, Kyle Busch sustained serious injuries when his car crashed head-on into an exposed concrete wall during an Xfinity Series race at Daytona. Jeff Gordon was involved in another scary crash in Atlanta, slamming into a wall just beyond the cushion of the SAFER barrier.

Busch, missing his second straight Cup race while recovering at home from a broken foot and leg, sent out a tweet directed at NASCAR after watching Gordon’s crash on television.

“When will this end,” he wrote.

Gordon was not injured, but he appeared angry as he talked with a safety worker. Track officials had increased the amount of padding in Atlanta after Busch’s wreck, but there were still sections of unprotected walls, as there are at most tracks. Gordon’s crash will surely step up pressure on NASCAR to mandate protective padding on all concrete walls.

“Hopefully, soon, they’ll get that fixed,” he said.