One of several Canadian players inside the top 100 in the World Rankings, David Baillargeon first featured on the Tour back in 2012.

Three years later, the Canadian made it to a quarter-final as a professional for the first time, before making the semis of the MAA Invitational later that year as well. He had further quarters and semis appearances over the next couple of years, before making his first final at the end of 2017, at the Life Time Florida Open.

Baillargeon secured his first victory at the 2019 Guilfoyle PSA Squash Classic, defeating Jaymie Haycocks in the final. That was followed by another appearance in a final, this time at the International Squash Classic.

Two more runners-up finishes were added to his tally in 2020, with the Canadian making it to the final of both the Life Time Atlanta Open and the Mount Royal University Open.

He started 2021 with another runners-up finish, at the Torneo Profesional Mexicano de Squash, before then winning back-to-back titles at the Colombian Open and the Squash Quebec Open, beating compatriot Nick Sachvie in the latter on home soil.

After making the final of the Equinox Boston Open, Baillargeon then claimed another victory, winning the Oxford Properties Canadian Senior Championships, beating Shawn DeLierre in the final. He then reached the final of the Gatineau PSA Challenger before ending 2021 with semi-final appearances at the 1st Guatemala Open Squash Tournament and the Cricket Club 10k.