Inclement weather dogged NASCAR again today as all of Friday's on-track activity at Charlotte Motor Speedway was canceled due to rain.Saturday's schedule will now be as follows:Sprint All-Star Race practice, 9:30 a.m. ET on FS1.Sprint All-Star pit road speed practice, 10:05 a.m. ET on FS1.Sprint Showdown, 11 a.m. ET on...

NASCAR has made changes to its All-Star race format ahead of the race later this month in a bid to make it "must-watch" for fans.The changes mean the main part of the event switches to two 50-lap segments from the three 25-lap segments last year.Mandatory pit stops will still be...