What's fueling Colombia's dominant Copa América run, and can they upset Argentina?

Colombia might be an underdog against Argentina in Sunday's Copa América final, but Lionel Messi & Co. will have their hands full against a side that is now unbeaten in its last 28 matches, a new record in Colombia men's soccer history.

That streak continued in impressive fashion in Wednesday's semifinal when Colombia defeated Uruguay, 1-0, despite playing most of the match with just 10 players after defender Daniel Muñoz was sent off with his second yellow card of the first half for elbowing Uruguay's Manuel Ugarte. 

Colombia has some recognizable faces, such as Liverpool winger Luis Díaz and former Real Madrid midfielder James Rodríguez, who is having a resurgent Copa América with a tournament-high six assists. But head coach Néstor Lorenzo's side hardly bests the on-paper blue-chip talent of Messi's Argentina or fellow CONMEBOL heavyweight Brazil. 

Rather, it's the mentality of this Colombia team that has made it so dominant, as "FOX Soccer NOW" co-host and former Colombia women's national team player Melissa Ortiz opined when Wednesday's result went final.

"The amount of passion and sweat [from] these young players, a man down this entire half … defending with all their lives, but still going at it," Ortiz pointed out. "They didn't sit back. They didn't park the bus."

That tenacity is why Colombia's chances to win Sunday's title game should not be dismissed despite going against a star-studded Argentina side ranked No. 1 in the world by FIFA and eyeing its third consecutive major tournament win.

"This Colombia team — you see the unity, you see what Néstor Lorenzo has built with all the players that he's selected," Ortiz said. "There were a lot of questions [from Colombian fans and media] on the player selection