Mark Kastelic (racing driver)

Mark Kastelic is a Slovenian racing driver currently competing for Lema Racing x Mapetrol in the GT4 European Series.

Career

Kastelic began karting at the age of five, and made his debut in international races at the end of 2018. Remaining in WSK-organized championships for 2019, Kastelic won the Trofeo D'Autunno in the X30 Mini class with Team Driver Racing Kart. The following year, Kastelic remained with the team in Mini karts finished runner-up in the Trofeo D'Autunno and third in the Champions of the Future Euro Series. Kastelic then raced for DPK in early 2021, before switching to Forza Racing as he stepped up to Senior Karts during the year, with whom he remained until 2023. In his three-year tenure with Forza Racing, Kastelic most notably finished 10th in the South Garda Winter Cup in the OK class in 2021. During the same year, Kastelic represented Slovenia in the Karting Academy Trophy.
Stepping up to cars in 2024, Kastelic competed for Lema Racing in the ESET Cup Series – GT4 class and XGT4 Italy series. In the former, Kastelic won both sprint races at the Red Bull Ring and the sole endurance race at the same venue to finish third in both standings. In the latter, Kastelic took a lone win at the season-ending round at Misano en route to a third-place points finish. During 2024, Kastelic also debuted in the GT4 European Series and Iberian Supercars championships for the same team. At the end of 2024, Kastelic was named as Talent of the Year by the Slovenian Motorsport Association - AŠSLO.
Kastelic remained with Lema Racing the following year to compete in both the GT4 European Series, XGT4 Italy and Iberian Supercars series. In the European Series, Kastelic finished no higher than 15th across the first three rounds, before taking his maiden points of the season at Misano by finishing fifth in race two. In the following round at the Nürburgring, Kastelic finished 11th among the Silver Cup entrants in race one and retired due to a front-left puncture in race two, before ending the year with another points-scoring finish at Barcelona en route to a 17th-place points finish in the Silver Cup.
In the Italian series, Kastelic won the season-opening round at Imola, before winning both races at Monza and Vallelunga, and won the season-ending race at Misano to secure runner-up honors. Racing in the GT4 Pro-Bronze class of the Iberian Supercars, Kastelic won race two at Algarve to kick off the season, before finishing third in both races in the following round at Valencia and scoring a further win at Jerez to end the season fourth in the class standings. During 2025, Kastelic was also once again named as Talent of the Year by the Slovenian Motorsport Association - AŠSLO. At the end of the year, Kastelic tested GT3 machinery for Boutsen VDS at Barcelona.