The 23-year-old had been on the sidelines since losing his seat with Haas on the eve of the 2022 F1 campaign after Russia's invasion of Ukraine, but made his sportscar debut in the first of four four-hour races to be held over the next fortnight on Saturday.
Mazepin teamed up in 99 Racing's ORECA-Gibson 07 with 2016 Le Mans 24 Hours winner Neel Jani and Portuguese Goncalo Gomes, the latter a late replacement for Felix Porteiro when the two-time World Touring Car Championship race winner had his Bronze driver rating upgraded to Silver.
