Leblanc attended Georges Vanier Secondary School in Laval, Québec.[1] He was drafted by the Milwaukee Brewers in the 33rd round of the 2013 MLB draft, but did not sign and instead attended the University of Pittsburgh to play college baseball for the Panthers.[2] He hit .292 with 3 home runs and 30 RBI as a freshman in 2015. In 2016 he hit .405/.494/.513/1.006 with 2 home runs and 46 RBI, and was named First Team All-ACC .[3] Leblanc was drafted by the Texas Rangers in the 4th round of the 2016 MLB draft and signed with them.[4]
On December 8, 2021, Leblanc was selected by the Miami Marlins in the minor league phase of the Rule 5 draft.[9] He opened the 2022 season with the Triple–A Jacksonville Jumbo Shrimp.[10] On July 29, 2022, Miami selected Leblanc's contract and called him up to the major leagues for the first time.[11] On July 30, LeBlanc collected his first career hit, a standup double off of New York Mets starter Carlos Carrasco.[12] The next day, LeBlanc hit his first career home run off of Philadelphia Phillies starter Taijuan Walker.[13]
On January 4, 2023, Leblanc was designated for assignment by the Marlins after the signing of Jean Segura was made official.[14] He cleared waivers and was sent outright to Triple–A Jacksonville on January 11.[15] In 94 games for Triple–A Jacksonville, he batted .253/.384/.423 with 12 home runs and 34 RBI. Leblanc elected free agency following the season on November 6.[16]
Los Angeles Angels
On November 26, 2023, Leblanc signed a minor league contract with the Los Angeles Angels.[17]