On Sunday, many of the 13,000 Argentinians living in Australia are expected to rise to watch the first leg of the Copa Libertadores final from Boca's La Bombonera stadium.
It is considered the most important 'superclasico' match of all time as it's the first time both Buenos Aires clubs will meet in the final of South America's biggest club competition.
This unprecedented event will be watched with heightened emotion and passion, according to Sydney-based River fan Santiago Moscatelli, who has travelled as far as Japan to watch his beloved team.
"For me, River is the most beautiful thing. It gives me a lot of joy and suffering. It takes me to the grave and to the sky," Mr Moscatelli told SBS Spanish.
On the other side of the coin, Sydneysider Löeby Lovato said his blood flows in the colours of Boca.
River fan Santiago Moscatelli Source: Santiago Moscatelli
"As a fan of Boca, nothing compares to a final against River. It is even bigger than my life when it comes to the final of the Copa Libertadores and above all, one that is played for the first time," he said.
"Boca must win, there is no other result."
The rivalry between the 'bosteros' (Boca) and the 'millionaires' (River) will be watched in mostly peaceful surroundings in Australia, which will be vastly different to Argentina.
Dozens of fans have died at football stadiums across Argentina over the years, and despite heightened security, both clubs have urged their fans to "celebrate" the match.
"I am not a fan of River or Boca, but it is a very important series for Argentinians that will surely remain in the history of the 'boastful' neighbourhood," impartial fan Víctor Piñero said.
"The fans of Boca and River are going to live as if it were the final of the World Cup, like if it was Argentina facing Brazil."
Mr Piñero said Argentinians unanimously condemn violence between football fans but admits it's a "very sad reality".
Glen Jonathan Sarmiento and other Boca fans Source: Glen Jonathan Sarmiento
He said, "it is the faithful reflection of an aggressive and intolerable society that rots due to corruption".
Mr Moscatelli also pointed out that "soccer reflects what Argentine society is... but in Australia, things are more relaxed".
In Australia, the rivalry can reach its extremes, but Mr Lovato said friendly wages were usually made.
"You make a life bet, a lunch, a pizza or an Argentine barbecue, anyone who loses must pay the other and endure a week of jokes with memes of the losers, photos, videos and texts," he said.
Victories and defeats are felt deeply, River fan psychologist Gabriela Salabert said
Ms Salabert remembers the feeling of disappointment when River was relegated to the second division in 2011.
She was working at Sydney's Fairfield hospital at the time.
"I can not tell you the slump that many patients lived, fans of the millionaires," she said.
For many fans, the clubs represent everything that is associated with day-to-day life.
"For me being a Boca fan is a connection with my grandfather and my dad, since the rest of the family goes for River," said Marina García Ricci.
Ms Ricci said she remembers that there were many times when family arguments arose around the dinner table when Boca won.
Marina Garcia Ricci, a fan of Boca Source: Facebook
"I come from a very Spanish family on my father's side and very Italian on my mother's side. In Argentina, the Italians usually follow Boca, it is a team with roots and bases in the neighbourhood," she said.
Mr Lovato said during his school years, the majority of his classmates supported either Boca or River and that his father, wouldn't let him choose either of them.
"As my Italian nona (grandmother) and I joked, in the end I was able to follow Boca," he said.
"I feel sorry for my father, who against his will, took me to La Bombonera, the same year that Boca won everything in 78-79, and I saw Diego Maradona play and win the Boca. I got intoxicated with his football, his passion, the colours. It was unforgettable. Those who have been at La Bombonera know the feeling. It is something really special. It really makes you tremble."
(Getty Images) Source: Getty
"I played my whole childhood with my uncles, my grandfather, on Saturdays listening to River play - most of the players of the national team were from River. There's a pride being from River."
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