Antonin made his international début taking part in the Junior World Championships in 2010 where he won the silver medal in relay.
In March 2014 he made his World Cup début in Oslo thanks to great performances in the IBU Cup 1, coming 25th in the pursuit and 24th in the individual.
Moving on to the World Cup circuit in December 2017, he first stepped on to the podium in the French stage at Grand Bornand.
Titles won:
Bronze Medal at the biathlon European Championships in the sprint event in 2015
10 podiums in the World Cup:
-5 individual: 2 coming in at second place, 3 coming in at third place
-3 podiums in the relay: 3 coming in at second place.
-2 podiums in the simple mixed relay: - 1 first place, 1 third place.
3rd at the World Cup in relay of Hoch Filzen in 2019
11th worldwide in 2018-2019
Vice World Champion mass-start 2019