Calls his parents, Hugo Dellien andSilvana Velasco, his heroes. They always supported his decisions and helped him reach where he is today.
Has a brother, Hugo Dellien, who is a professional tennis player. Has another brother, Iker Dellien.
Began playing tennis aged three in Trinidad, Bolivia because his older brother Hugo was playing. Grew up watching him playing tournaments and becoming a top player.
At 19, went to college in the United States at Wichita State University. After graduation, moved to Argentina to train.
Favourite shot is serve, surface is hard, tournament is US Open and city on Tour is Praga.
Tennis idol is Juan Martin Del Potro, favourite athlete is Marcelo Martins.
Outside of tennis, favourite sport is football and favourite team is Club Blooming (Bolivia).
Calls NBA legend Kobe Bryant a superhero.
Favourite book is El Negociador by Arturo, TV show is Shark Tank.