Guillaume De Ridder began his career as a junior kart racer, securing the Belgian KF2 championship title before progressing to rallying in 2013 and competing in the Ford Fiesta Sport Trophy.
De Ridder subsequently moved to the Group N category in 2014 and was a class winner in the Belgian Rally Championship, competing in rallying for two more seasons before switching to rallycross and RX2 – the predecessor to RX2e.
Placing third in his first year, De Ridder came even closer to the title in 2018 with four podiums – including two victories – from seven starts but ultimately finished second behind Oliver Eriksson.
The Belgian stepped up to the FIA World Rallycross Championship in 2019 but had a difficult campaign marred by unreliability and bad luck. Having sat out much of the disrupted 2020 season, De Ridder returned to action in the single-weekend RX2 showdown at Nysum in Denmark and won the first leg of the double-header but missed out on the title by a single point to Henrik Krogstad.
De Ridder has a keen interest in the technological aspects of RX2e thanks to his role as a Power Unit Performance Engineer for the Alpine F1 Team.