NASCAR's Denny Hamlin was hospitalized overnight after being airlifted to a hospital after a hard single-car crash on final lap of Sunday's Auto Club 400.
Hamlin was awake and alert in the infield care center before being transported, but was taken to a hospital after complaining of lower back pain.
A helicopter was used due to post-race traffic.
The scary incident happened as Hamlin was helped from his car after the hard hit and seemed to collapse outside his car after he had pulled the net down.
Hamlin's girlfriend, Jordan Fish, tweeted on Sunday night: "Thank u everyone for your messages concerning Denny. Darian is keeping us posted."
"He's alert n awake, main concern is his back #PrayersforDH"
Joey Logano and Hamlin, who have traded barbs since the season opening Daytona 500, battled side by side, bumping and passing in the closing laps.
They were drag racing down the backstretch, but Logano went into the outside wall, Hamlin went into the inside wall and Kyle Busch sailed by for the win.
"After what happened last week, that's what (Hamlin) gets," Logano said after the race. "We have nothing to hang our heads about, that's for sure."