Beginning the season at the 2018 CS Lombardia Trophy, Guignard/Fabbri won their third straight title. Competing at the 2018 Skate America event, they won the silver medal, the team's first on the Grand Prix. Fabbri remarked that the medal "is a great reward for us. We started from zero when Charlene and I started skating together. I had just started ice dance and she didn't have international experience. We are proud of what we have achieved." They won silver at their second event, the 2018 Grand Prix of Helsinki, as well, despite a fall in the free dance. These results qualified them for the Grand Prix Final for the first time in their careers. At the Final, they placed second in the rhythm dance and third in the free dance, capturing the bronze medal overall.