Football.
My team is Boca Juniors. Currently we are the football team with most international cups won in the world. More than Milan and Real Madrid (we even defeated them in the Intercontinental Cups).
We are also one of the three only football teams that have the UNICEF shield on the shirt. The two other teams are Barcelona and Chelsea.
What's so great about these things is that Boca is a South American team and does not have all the money that European teams do have, yet Boca is still one of the most important football clubs in a worldwide magnitude.
Our local nemesis is River Plate, and they are doing so badly these years that Boca Jr. has more international thirst than local.
Plus we have Roman Riquelme in our team. One of the best player in the world and so incredibly underrated by Europe. The explanation to this is that Europe likes fast football which imo is boring. Roman has visionary skills to play paused football, which imo is more "poetic" and orchestrated.
Way to go.
Basketball.
I root the Spurs because of Manu Ginobili.
If I had to decide which is the current best sportman in our country, that would be Manu Ginobili. Not only he managed something that very few terrific players get in their lifetime, 3 NBA rings, he is also one of the Spurs' Big Three. His is best when time is short and the pressure is too high. You don't see MVP Parker doing the last quarters as much as you see Ginobili. Coach Pop tells the guy to pass the ball to Ginobili when the ball is hot. Because this guy simply has the nerves to fight hard times.
But Ginobili is not only NBA.
He lead the Argentine basketball team to the gold medal in the Athena Olympics 2004 (where we smashed the Dream Team in semifinals). In 2001 we almost won the World Cup, losing due to a bad referee decision.
Plus he is our greatest sport ambassador in America, a country so imperial and xenophobic in their sports.
Tennis.
Although we miss the times when we had FOUR tennis players in the Top Ten (that was 2 years ago) with Guillermo Coria, Guillermo Cañas, Gaston Gaudio and David Nalbandian, I love this sport.
The latest great cup won by an argentine happened in 2005 when David Nalbandian defeated Roger Federer (who is in his way to become the greatest tennist player alltime, he's practically undefeatable) to seize the Master Cup. (This is a Cup that although has 8 players and lasts a week, only the Top 8 seeders can play it. Therefore it is a cup as important as a Grand Slam. Around 1400000 dollah for the winner.).
And though we won 5 ATP tournaments this year (3 by Pico Monaco, 1 Chela and 1 from Willy Cañas), the most amazing thing that happened this year was Willy Cañas amazing return to the top 20 after being unfairly suspended.
In this meteoric return, Cañas did the unbelievable... twice:
in less than 2 weeks he defeated Nº1 Roger Federer two times.
First at the Indian Wells. Then at ATP Miami and finishes as a finalist.
Nobody except Nadal on clay (Nº2 of the world and emperor of clay courts, owns an unbelievable record of 81 consecutive wins on clay, this is like 3 years of not losing on clay) can do this to Federer.
Tennis is also the sport I enjoy most to play on my own