Jimmie Johnson Wins Michigan Happy Hour, Crashes Primary Car

Jimmie Johnson had an eventful Saturday at Michigan International Speedway.

The day started off with promise. He posted the third-fastest speed in the first of two practice sessions. Then, in Happy Hour, he turned the fastest lap during the 55-minute practice.

Moments after turning the quick lap, disaster struck, according to Kenny Bruce of NASCAR.com (h/t Yahoo! Sports). Entering Turn 3, Johnson's car got loose, and he slammed into the outside wall. 

The damage was significant, and the team was forced to bring out the backup car. Johnson, who qualified third for Sunday's Pure Michigan 400, will now have to start the race from the back of the field as a result of the crash.

Prior to the accident, he turned a fast lap of 199.457 miles per hour. The quick lap took 36.098 seconds and was more than one-tenth of a second quicker than second-place runner Juan Pablo Montoya.

Johnson and his team were able to get the backup car onto the track for a handful of practice laps just prior to the conclusion of Happy Hour.

In his backup car, he ran a lap that would have put him 18th on the speed chart.

Sunday's race will mark the second time this season that Johnson has been forced to start at the back of the field.

Back in July, he qualified second in New Hampshire but had his time disallowed when his car failed post-qualifying inspection. 

Forced to start from the 43rd and final position in the field, he raced to a sixth-place finish.

Chevrolets dominated the afternoon practice session as six of the seven quickest drivers were Chevrolet drivers. Behind Johnson and Montoya were Greg Biffle, Kurt Busch and Jeff Gordon rounding out the top-five fastest drivers.

Pole sitter Joey Logano posted a fast lap of 196.780 miles per hour, which was good enough for just 22nd place in the session.

Sunday's race from Michigan is set to take the green flag at approximately 1:16 p.m. ET with television coverage on ESPN.