Argentina and Paraguay meet for the second time at Copa América 2015, but this time the stakes have been raised from their initial group-stage clash.
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The two nations will go head-to-head at the Estadio Ester Roa in Concepción on Tuesday night, with the winners booking a place in the final.
La Albirroja came from behind in their opening fixture against La Albiceleste, with two second-half goals helping them earn an important point in a 2-2 draw.
Argentine-born striker Raúl Bobadilla - who only made his Paraguay debut this year - confessed to apprehension in that fixture.
"In the first match against Argentina I played against my nerves - it was all new to me," he told La Nacion.
"Starting against Argentina was an incredible dream. It's like I can't quite believe what is happening to me."Ramón Díaz's men progressed to the final four after eliminating Brazil in the quarter-final stage in Concepción.
The striker believes their path to the semi-finals has been built upon a great team spirit and exemplerary coaching, and they're are primed to cause an upset on Tuesday and eliminate a side considered among the favourites for the trophy.
"This team has a special attitude. Nobody gave us anything, but we are no less than anyone else," Bobadilla added.
"We do not have the players that Brazil, Argentina or other national teams do.
"We were facing each game with intelligence and with the guidance of the coaches, led by Ramón Díaz, we can work things out.
"His experience has allowed us to see things in opponents that when we play enables us to hurt them or defend against them."Ramón pulled this team along when nobody would give two pesos for us. We are going out to beat Argentina."
However, Roque Santa Cruz recently commented that Gerardo Martino's side have improved since their first meeting.
And although La Albiceleste could not find the net in their last-eight clash with Colombia - requiring a penalty shoot-out to advance - his sentiments were echoed by Javier Pastore who feels Argentina produced their best display yet in the quarter-finals.
"I think [last Friday against Colombia] was the best of the era of Tata [Martino]," Pastore said. "We played perfectly, but we still lack a goal."
La Albiceleste are bidding to win the title for the first time since 1993 and end a run of 22 years without a senior trophy, but with Lionel Messi, Sergio Agüero and Javier Mascherano all a booking away from a ban that would rule them out of a potential final, they cannot run too many risks.
Paraguay - who Martino led to the final four years ago in Argentina - also have Bruno Valdez, Pablo Aguilar and Osvaldo Martínez on the brink of a suspension, while Néstor Ortigoza is not expected to return to fitness in time to feature after picking up a hamstring injury earlier in the competition.