There was no shortage of onlookers surrounding United Autosports' IMSA Prototypes at Daytona last weekend, but watching on with particular interest were Michael Andretti and members of his Andretti Autosport team.The championship-winning driver/owner was at the Rolex 24 with team leaders JF Thormann, Rob Edwards, and technical director Eric Bretzman...

UPDATE: RACER has learned IMSA Continental Tire Series entrant Ken Murillo has lost his house in the Northern California wildfires, while 1996 CART IndyCar Series champion Jimmy Vasser lost a portion of his V12 Vineyard in Napa to the fire. 1969 Indy 500 winner Mario Andretti reported the nearby Andretti...

Tequila Patron ESM's Brendon Hartley set the fastest lap of the event (1m12.307s) under dark skies in his Nissan Onroak DPi. Run in hot and humid conditions with the moon overhead, June's Le Mans winner put a healthy distance between himself and Filipe Albuquerque in the No. 5 Action Express...

It was upset Sunday at Mazda Raceway Laguna Seca as the dominant drivers at the halfway point of the 2h40m contest were nowhere to be found at the checkered flag.The big news for IMSA's WeatherTech SportsCar Championship took place in Prototype where a WEC P2 chassis scored its first overall...

Jordan Taylor set the stage for this weekend's Continental Tire Monterey Grand Prix by opening Friday morning's practice session with the fastest lap in his No. 10 Wayne Taylor Racing Cadillac DPi-V.R.The Floridian held a comfortable lead for most of the one-hour session with his 1m18.462s blast around the 11-turn...

It was not the result Wayne Taylor Racing has come to expect in 2017 – off the podium at the IMSA WeatherTech SportsCar Championship Sahlen's Six Hours of The Glen and done with a dominant five-race win streak. At the drop of the green flag, Ricky Taylor's Konica Minolta Cadillac...

The PR1/Mathiasen Motorsports team is continuing its preparations for a move up to IMSA’s Prototype class next year. As shown in a video recently captured at Sebring International Raceway, the Bobby Oergel- and Ray Mathiasen-owned WeatherTech SportsCar Championship program has been busy logging miles with the factory-supplied Ligier JS P217-Gibson...