The 2009 World Junior Short Track Championships were held in his hometown of Sherbrooke. Antoine won a silver medal in the 1000 m and a bronze in the 1500 m race; this aided his 4th-place finish overall as a 16-year-old. Gélinas-Beaulieu was named Quebec's male national athlete of the year at the 37th annual Sports Québec Gala on December 23, 2009.[1] At the following junior short track championships in 2010 in Taipei he won five silver medals in the 500m, 1000m, 1500m super final, 3000m relay, and the overall silver medal.[2][3][4]
Gélinas-Beaulieu also received two bronze medals at the 2010 World Junior Speed Skating Championships in long track. He received the bronze medals in the 1500 m and the 5000 m.[5] He also finished third overall in the competition.