At the 1998 European Championships he won a silver medal in 4 x 100 metres relay with teammates Thierry Lubin, Christophe Cheval and Needy Guims. As the European champions Great Britain fielded their own World Cup team, the French relay team was selected to represent Europe at the 1998 IAAF World Cup, finishing sixth while Great Britain won the event.
Krantz later finished fifth in relay at the 2000 Summer Olympics, this time with teammates Cheval, Guims and David Patros. He also competed in the 2004 Olympic relay and reached the 200 m quarterfinals of the 2001 World Championships.
His personal best time was 20.49 seconds, achieved in July 2001 in Saint-Étienne.
- 1998 European Championships, men's results (Sporting Heroes)
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