Auger-Aliassime was born to Togolese father Sam Aliassime and Quebecker mother Marie Auger in Montreal, Quebec.

She picked up a racquet for the first time at 6 and was a member of the Académie de Tennis Hérisset-Bordeleau in Quebec City in her early years, coached by her father Sam.

[1] Auger-Aliassime made her professional debut at the 2015 Coupe Banque Nationale in September where she lost in the qualifying first round.

[2] She made her WTA Tour debut at the same tournament, having received a wildcard with Charlotte Petrick into the doubles main draw.

They were defeated by Barbora Krejčíková and An-Sophie Mestach in the first round.