A trio of Run Group winners from March’s season-opening Historic Sportscar Racing Sebring Classic 12 Hour Presented by Mission Foods heads to Watkins Glen International next weekend, June 11-14, looking for repeat victories in the inaugural season of the HSR Classic Endurance Championship presented by Mission Foods.
The first major endurance race championship in the U.S. for vintage and historic sports cars, the HSR Classic Endurance Championship presented by Mission Foods features a year-long schedule of four “tribute events” celebrating the biggest and longest-running sports car endurance races in the United States.
The Sebring Classic 12 opener ran the weekend before the 73rd running of the Mobil 1 Twelve Hours of Sebring IMSA event while next weekend’s HSR Watkins Glen Classic 6 Hour presented by Mission Foods sets the stage for the annual Sahlen’s Six Hours of The Glen IMSA race on the upstate New York circuit one weekend later.
Porsche pilots and 901 Shop teammates Todd Treffert and David Agretelis each broke through for overdue HSR Classic Endurance Championship victories at the Classic 12 where they were joined in the win column by multiple HSR Classic Endurance race winners Pierce Marshall and Eric Foss.
Marshall and Foss were victorious in Run Group C at Sebring in the 2017 No. 02 Matador Motorsports Cadillac DPi for their third win in the last four HSR Classic Endurance events. The run of race wins dates back to the Classic 6 last year, and nothing short of a repeat victory when the Matador team returns to The Glen next weekend is the goal.
Successful and longtime HSR competitors, Treffert and Agretelis hope to join Marshall and Foss in staying a perfect “two-for-two” to start the inaugural HSR Classic Endurance Championship presented by Mission Foods season. Treffert has been victorious in just about every class and series he has contested in HSR’s season-long sprint and endurance championships, but an HSR Classic win eluded him for over a decade before the Sebring breakthrough in Run Group B. He competes in his 1975 No. 41 Porsche 911 Carrera Cup RSR “Baby” Turbo prepared by the 901 Shop.
Agretelis had been trying to win an HSR Classic race for eight years. He won the second Run Group A round at Sebring to take a lead he would hold to the finish in his 901 Shop 1972 No. 66 Porsche 911 S/T.
A four-day event Wednesday, June 11 through Saturday, June 14, the HSR Classic 6 Hour weekend also features a full slate of HSR WeatherTech Sprint, B.R.M Endurance Challenge and the Sasco Sports International American Challenge presented by Hoosier and HSR Global GT races that are all part of the season-long 2025 HSR championships.
Another can’t miss event is Thursday evening’s HSR Prototype Challenge Presented by Michelin 90-minute race into twilight.
Debuting last year, the second season of the HSR Prototype Challenge presented by Michelin features an expanded class structure in 2025. Open only to LMP3 cars in 2024’s inaugural HSR Prototype Challenge season, the series has fully expanded to four different classes this year.
From the top-tier P1 class for retired LMP1 and DPi cars down to the P4 division for first generation Daytona Prototypes and in between, the Challenge series has a class for every type of contemporary prototype just past its competitive prime.
The weekend’s main event, however, is the actual HSR Watkins Glen Classic 6 Hour presented by Mission Foods that begins with a symbolic six-straight hours of racing late Friday afternoon into the night as each Run Group contests its first two segments. One final round for each Run Group Saturday afternoon will determine this year’s HSR Classic 6 Hour winners.
For more information on the HSR Watkins Glen Classic 6 Hour presented by Mission Foods, including the event schedule, current entry list, Run Group and HSR Class structure and more, please visit the Official Event page at www.HSRRace.com.
