WHEN/TV/RADIO: 4:30 p.m. Saturday, Speed (Digital 329), KCYE (104.3 FM)

MORE TV: Qualifying, 2:10 p.m. today

FORMAT: The Sprint Open qualifying race will consist of 40 laps with the top two finishers advancing to the Sprint All-Star Race, which will include a driver selected by fan voting after the Open. ... The All-Star race is run in four segments of 25 laps each. ... Twenty-one drivers are locked into the 24-car All-Star race by virtue of either winning a Cup race this year or last, or by earning a series championship or All-Star title during the past 10 years.

2007 ALL-STAR WINNER: Kevin Harvick

NEXT: May 25, Concord, N.C.

NATIONWIDE

No racing this weekend

NEXT: May 24, Concord, N.C.

NASCAR TRUCKS

THE RACE: North Carolina Lottery 200; Concord, N.C.

WHEN/TV: 5 p.m. today, Speed (Digital 329)

QUALIFYING: 12:35 p.m. today, Speed

LAST WINNER: Ron Hornaday (April 26)

2007 WINNER: Hornaday

NEXT: May 24, Mansfield, Ohio

LAS VEGAS: Sept. 20

NHRA DRAG RACING

THE RACE: Thunder Valley Nationals; Bristol (Tenn.) Dragway

WHEN: Today through Sunday

TV: Qualifying, 3:30 p.m. Saturday, ESPN2 (Cable 31), tape; eliminations, 3:30 p.m. Sunday, ESPN2, tape

LAST WINNERS: Rod Fuller (Top Fuel), Tim Wilkerson (Funny Car), Kurt Johnson (Pro Stock), Andrew Hines (Pro Stock Motorcycle)

2007 WINNERS: Brandon Bernstein (Top Fuel), John Force (Funny Car), Jeg Coughlin (Pro Stock)

NEXT: June 1, Topeka, Kan.

LAS VEGAS: Oct. 30-Nov. 2

INDY RACING LEAGUE

No racing this weekend

NEXT: May 25, Indianapolis

SPORTS CARS

THE RACE: RumBum.com 250, Grand Am Rolex Sports Cars Series; Mazda Raceway Laguna Seca, Monterrey, Calif.

WHEN: 1:45 p.m. Saturday

TV: 9 a.m. Sunday, Speed (Digital 329), tape

NEXT: May 26, Lime Rock, Conn.

LOCAL

TODAY: Bracket test and tune, 6-9 p.m., Las Vegas Motor Speedway dragstrip

Midnight Mayhem (street-legal drags), 9 p.m.-1 a.m., LVMS dragstrip

SATURDAY-SUNDAY: Championship Off Road Racing (short-track, desert racing), Buffalo Bill's, Primm, racing begins at 12:30 p.m. each day; corracing.com

SATURDAY:

Short Line Express Youth Racing Series (NHRA Jr. Dragsters, Quarter Midgets), 9 a.m.-2 p.m., LVMS dragstrip

Jerry's Nugget Drag Racing Series (E.T. bracket racing, high school drags), 5-11:30 p.m., LVMS dragstrip

Battle of the Bullring (SuperClean Modifieds, West Coast Pro Trucks, Legends, Bombers, Bandoleros), racing begins at 5 p.m., features at 7, LVMS Bullring

Death Valley Raceway, Amargosa Valley (IMCA Modifieds, Super Stocks, Mini Stocks, Micro Sprints, Modified Minis, Classic Coupes), racing begins at 7 p.m.

INFORMATION: Las Vegas Motor Speedway (LVMS.com, 644-4444), LVMS Bullring (632-8422), LVMS dragstrip (632-8459), Death Valley Raceway (775 209-5291)

TIMES AND EVENTS SUBJECT TO CHANGE