Kyle Larson beat Chris Buescher at Kansas on Sunday in a green-white-checkered finish and the closest finish — a thousandth of a second — in NASCAR history.

The series is in Darlington this weekend for its annual throwback weekend on Mother's Day.

Larson’s win was his second of the season and the sixth for Hendrick Motorsports through 12 races. Hendrick’s Byron and Denny Hamlin of Joe Gibbs Racing have each won three times. Larson leads Martin Truex Jr. by 29 points and Chase Elliott by 55 points. 

Larson’s six top-five finishes are the most in the series. Truex shares the lead with three others with seven top-10 finishes. 

Only seven drivers have won races this season.

Byron won the spring race at Darlington last year. Practice and qualifying is at 9:30 am on Saturday and race time is at 2 pm on Sunday afternoon. 

Ryan Truex won at Dover for the second straight year, giving the younger brother of Martin Truex Jr. the only NASCAR victories of his career.

The XFinity Series is back in action after a week off this weekend in Darlington.

Chandler Smith leads Cole Custer by one point and Austin Hill by 17 points. Smith and Hill are the lone two-time winners through 10 races. Smith leads with six top-five finishes and he and Custer share the lead with eight top 10s.

Larson raced in the spring XFinity Race at Darlington last year and went to victory lane. Practice and qualifying is at 4 pm this afternoon. Race time is at 12:30 on Saturday.

Corey Heim passed Nick Sanchez for the lead on lap 70 of 134 and led the rest of the way at Kansas for his second Craftsman Truck Series victory of the season.

Heim’s victory was the seventh of his career. It was his series-best sixth top-five finish and eighth top-10 in as many races and moved him within two points of Eckes for the series lead. Zane Smith, the 2002 series champion, finished second.

At Darlington this week, the Craftsman Truck Series practices and qualifies this afternoon at 2 pm and race time is tonight at 6:30 pm.