Marco Fabbri was born on 2 February 1988 in Milan, Italy. He is the elder brother of Italian ice dancerAndrea Fabbri. He and Guignard have been in a relationship since 2009.
Career
Early career
Fabbri began learning to skate in 1995. He won Italy's novice ice dancing title with Stefania Berton but then concentrated on singles from 2001 to 2007. As a single skater, he won two junior national titles and three senior national medals – bronze in 2004 and 2005 and silver in 2007. Deciding to return to ice dancing, he teamed up with Paola Amati and won the 2009 junior national bronze medal. He also competed with Francesca Mangini.
In the 2011–12 season, Guignard/Fabbri repeated as the Italian national silver medalists and placed 11th at their first European Championships in Sheffield, England.
The duo began the season with their second straight victory at Lombardia, as well as a silver medal at the 2017 CS Golden Spin of Zagreb. They placed fifth at both of their Grand Prix assignments, and won their eighth silver medal at the Italian Championships. The two finished ninth at the 2018 European Championships. Guignard/Fabbri competed at their second Olympics, this time in Pyeongchang, where they placed tenth. They finished the season at the 2018 World Championships, held in their training location of Milan, and placed ninth. Their result, combined with the fourth-place finish of Anna Cappellini and Luca Lanotte, earned Italy three spots at the following year's world championships.
2018–19 season: Grand Prix and European bronze, first national title
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 Finalfor 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. Following their Grand Prix success, Guignard/Fabbri won the Italian national title for the first time in their career. At the 2019 European Championships, they placed third in the rhythm dance, behind Gabriella Papadakis / Guillaume Cizeron and Alexandra Stepanova / Ivan Bukin. Expected medal contenders Victoria Sinitsina / Nikita Katsalapov made serious errors that took them effectively out of contention. Guignard/Fabbri were fourth in the free dance, behind Sinitsina/Katsalapov in third, but won the bronze medal overall. Fabbri opined that the free dance had been "our best performance. Scores don't always well the truth. Sometimes you feel you skated better, but you get less. Sometimes you feel you didn't skate that well and you get more points. This time we felt we skated our best." Guignard/Fabbri placed eighth at the 2019 World Championships in Saitama, and concluded the season as part of Team Italy at the 2019 World Team Trophy.
2019–20 season
Guignard/Fabbri won their fourth consecutive gold medal at the Lombardia Trophy to begin the season. Shortly afterward, Fabbri injured the tendons in his right hand, and for some time the team contemplated withdrawing from the Grand Prix as a result. However, a week before the 2019 Internationaux de France, the decision was made to compete. They placed third in the rhythm dance, while being the only team to correctly execute all keypoints on the pattern dance. Third in the free dance as well, Fabbri remarked afterward "we didn't think we would have been here until one week ago. We couldn't expect more from this competition." Following the French Grand Prix, Guignard/Fabbri opted to discard their original Paramour-themed rhythm dance in favour of music from Grease. Fabbri attributed the change to a desire for "something more understandable for the audience as well, because the old program had unrecognizable music." They were third in the rhythm dance. They placed fourth in the free dance after Guignard fell on a lift exit, winning their second bronze medal of the Grand Prix season. Fabbri said they had not had as much time to practice the rhythm dance whilst working to change the rhythm dance. At the 2020 European Figure Skating Championships, Guignard/Fabbri placed third in the rhythm dance, winning the small bronze medal. In the free dance, after a long wait for the score for the previous couple they placed fourth, falling to fourth overall.