Boivin's greatest cycling accomplishment was finishing in a dead heat for the bronze at the World Under-23 Road Race Championships in 2010.[7] He finished 3rd in the 2012 Tro Bro Leon, getting on the podium with his teammate Ryan Roth, who won the race.[8] In October 2014, it was announced that Boivin would leave Cannondale and ride with Optum–Kelly Benefit Strategies in 2015.[9] On 29 April 2015, on the first stage of the Tour of the Gila, Boivin was the last man remaining of a breakaway that was caught by eventual solo winner, Rafael Montiel. Boivin took the second place of the mountaintop finish.[10]
In May 2018, he was named in the startlist for the Giro d'Italia.[11]
^Atkins, Ben (3 December 2012). "Lucas Sebastian Haedo to Cannondale Pro Cycling in 2013". VeloNation. VeloNation LLC. Retrieved 4 January 2013. Haedo will join Sagan, Guillaume Boivin – who joins from Spidertech p/b C10 – and Elia Viviani as one of the team's sprint specialists.