Kratz began racing cars in 2011, competing at the
24 Hours of Nürburgring in the SP4T class for
ADAC Nordbaden. Racing primarily at the
Nürburgring until 2021, Kratz won the 24 Hours of Nürburgring in Cup 5 class in 2015, the V4 class in 2017 and 2018, as well as the KL Cup in the latter year. During 2021, Kratz also made his debut in endurance prototypes, joining WTM Powered by
Phoenix to compete in the LMP3 class of the
Le Mans Cup alongside Leonard Weiss, the son of WTM owner Georg Weiss. In his first season in the series, Kratz finished third at both
Spa and
Algarve to end the year eighth in points. . . Kratz started off 2022 in the
Asian Le Mans Series for Rinaldi Racing in the LMP3 class, taking a lone podium at
Abu Dhabi to secure third in points. For the rest of the year, Kratz joined WTM Racing for a dual campaign in both the
Le Mans Cup and
Prototype Cup Germany. In the former, Kratz qualified on pole three times, but was only able to score a best result of fourth twice as he rounded out the year eighth in the LMP3 standings. In the latter, Kratz won both races at the
Hockenheimring and finished on the podium twice at
Spa to secure runner-up honors in points despite missing the
Nürburgring round. Continuing with WTM by Rinaldi Racing for 2023, Kratz raced with them for a dual campaign in the LMP3 classes of the
Asian and
European Le Mans Series. Qualifying on pole for all four races of the former, Kratz was only able to take a lone podium at
Abu Dhabi to take fifth in points. In the latter, Kratz scored a lone win at
Algarve, as well as podiums at
Le Castellet and
Aragón to end the year third in points. During 2023, Kratz also raced for the same team in select rounds of the
24H GT Series, winning the 12 Hours of Estoril overall. In 2024, Kratz remained with WTM by Rinaldi Racing to race in the
European Le Mans Series, as well as returning to
Konrad Motorsport to race in
Prototype Cup Germany. Scoring a best result of fourth in the former and finishing 10th in the LMP3 standings, Kratz found more success in the latter, taking two wins at the
Lausitzring and five more podiums to secure runner-up honors. During 2024, Kratz also made a one-off appearance in the
Le Mans round of the
Le Mans Cup for WTM by Rinaldi, in which he won race one. Returning to WTM by Rinaldi for the
2025 European Le Mans Series season, Kratz scored a best result of fourth at
Imola en route to a 12th-place points finish in LMP3. During 2025, Kratz also made select appearances in the
24H Series for Hofor Racing, winning the
12 Hours of Spa-Francorchamps and the
24 Hours of Barcelona in GT3 Am. Kratz continued with Hofor Racing for the
2025–26 24H Series Middle East season, scoring a GT3 Am class podium at the
Dubai 24 Hour by finishing second in class and 12th overall. In 2026, Kratz continued with Hofor Racing to race in the
24H Series. == Racing record ==