DARLINGTON, S.C. — Martin Truex Jr. took the lead with 28 laps to go and held off Kevin Harvick on the final restart to win the Southern 500 on Sunday night. Truex started the summer season by leading an astounding 588 of 600 miles to win at Charlotte on Memorial Day weekend. He closed the season by outracing Harvick on Labor Day weekend for his second crown jewel win of the season.