News in depth

United Autosports opts against 2019 Daytona after IMSA class split

Christian Fittipaldi to retire from racing after 2019 Daytona 24

IMSA splits prototype classes for 2019, keeps similar calendar

Champion Racing team boss Maraj dies in boating accident

ESM 'working on scenarios' to stay in IMSA after sponsor Patron's exit

IMSA has alienated European teams with LMP2 BoP approach - di Resta

Aston Martin plans return to IMSA with new Vantage GTE

Penske's new Acura sportscar project takes first IMSA win

Sebring polesitter Spirit of Daytona ruled out of Long Beach IMSA

Sebring 12 Hours: IMSA BoP an embarrassing waste of time - di Resta

Sebring 12 Hours: #22 ESM Nissan squad wins close-fought race

Sebring 12 Hours: #22 ESM Nissan leads at halfway mark

Sebring 12 Hours: Vautier takes pole for Spirit of Daytona Cadillac

Sebring 12 Hours: Penske on top during opening practice sessions

IMSA/WEC sportscar rule divide like CART/IRL split - Castroneves

Paul di Resta gets additional Sebring and Watkins Glen IMSA outings

Mazda convinced of updated car's promise despite tough Daytona debut

Alonso hails Norris's 'impressive' speed on Daytona 24 Hours debut

Penske: Victory on Daytona 24 Hours debut was 'one that got away'

Alonso 'much more prepared' for Le Mans after Daytona 24 Hours debut

Daytona 24 Hours: Alonso 'scared' by loss of brakes at top speed

Daytona 24 Hours: Record-breaking Action Express wins, Alonso 38th

Daytona 24 Hours: Penske hits trouble, Action Express takes lead

Daytona 24 Hours: Puncture, brake problems hurt Alonso top-five bid

Daytona 24 Hours: Penske moves into lead, Alonso's race ruined

Daytona 24 Hours: Action Express leads Penske, Alonso's car sixth

Daytona 24 Hours: Cadillacs in front in first hour, Alonso 14th

Daytona 24 Hours: BMW says new M8 given unfair BoP for debut

Daytona 24 Hours: Castroneves says Cadillac holding back true pace

Daytona 24 Hours: Brown all but dismisses Alonso's win chances

Fernando Alonso surprised by his Daytona 24 Hours qualifying result

Daytona 24 Hours: Van der Zande on pole, Fernando Alonso 13th

Video: Alonso says win on Daytona 24 Hours debut a 'very big task'

Daytona 24 Hours: Rast tops FP1 for Mazda, Alonso's car picks up damage

Norris/Alonso United Ligier can't win Daytona 24 Hours on raw pace

Cadillac's pacesetter pegged back for 2018 Daytona 24 Hours

Ex-F1 driver Nasr: Cadillac's Daytona rivals held pace back in test

What we've learned from Alonso's sportscar debut so far

Fernando Alonso admits United Ligier needs more pace at Daytona

Jordan Taylor sets pace in final Daytona 24 Hours test session

Nasr leads Daytona 24 Hours mock qualifying, Alonso 12th

Daytona 24 Hours 'Roar' test: Nasr fastest, Alonso makes night bow

IMSA SportsCar boss: Expecting Indy 500-like Alonso boost 'naive'

Daytona 24 Hours 'Roar' test: Albuquerque leads for Action Express

Fernando Alonso using Daytona 24 Hours to test endurance enjoyment

Five-time Daytona 24 Hours winner Scott Pruett to retire in 2018

Risi Competizione Ferrari squad won't contest full 2018 IMSA season

McLaren F1 junior Norris wants to prove himself to Alonso at Daytona