Tomas Cubelli could be forgiven for being sick of the sight of Argentina teammate Martin Landajo. Born almost exactly a year after his fellow scrum-half, Cubelli has been forced to share the No.9 shirt with his elder colleague from age-group national teams right up to the senior Pumas set-up.
It is an approach that has again been in evidence during the Rugby World Cup with Cubelli starting the first two games -- against New Zealand and Georgia -- and Landajo coming into Daniel Hourcade's side thereafter.
But Cubelli refuses to grow frustrated by the situation as he prepares for a potential return to the Pumas starting XV for their biggest game in eight years.
"I've shared with Martin a lot of squads," he said ahead of Argentina's World Cup semifinal against Australia on Sunday.
"We used to play even in whole tournaments one game each. So it is a special rivalry for me, it is a pleasure to share and look for a jersey with another player.
"It makes sure you are always at your top."
Indeed, Cubelli believes that the squad's togetherness stems from their amateur heritage and is a key factor in their march into the last four. Of the team that started the quarterfinal win over Ireland in Cardiff, 11 had played for Pampas XV, a development side that competes in regional competitions, and until 2014 played in South Africa's Vodacom Cup.
"We are lucky to have very good rugby players, but we are even more lucky to have friends," he said. "It maybe comes with the way we are educated in our clubs in Argentina.
"Rugby in Argentina is amateur. First of all in most of the clubs you are educated as a good person, a good teammate and afterwards as a good player because sometimes we don't have the structures and the coaches that are studying the game too much.
"We don't have too many resources but the human resource is the thing we have and we have to do it good because if we don't have that we can't compete."
Argentina have definitely made the most of their resources in England, playing some scintillating rugby that has yielded 26 tries on their way to the last four. Their free-flowing attacking style has been honed since their admission to the Rugby Championship in 2012 and marks a sea-change from how previous Pumas sides set up.
Cubelli added: "I think it's very important to play without fear. It's very difficult to achieve it in a national team where there's a lot of pressure. But I think we could work (on) it during the Rugby Championship when we were playing the best teams in the world and we still tried to play as their equal and to have an ambitious rugby intention."
With the Wallabies boasting a similarly attacking outlook, Sunday's second World Cup semifinal promises to be a mouthwatering affair.