The award, officially known as the FIFA Ballon d'Or, came after the Barcelona player scored a remarkable 91 goals in 2012, a record for a calendar year.
People on the streets of Buenos Aires were excited about Messi's latest accomplishment.
"At 25 he has achieved things that no other football player has achieved at that age. He won - the only thing he is missing is a World Cup win," said Ivan Narducci.
"He deserves it, there is a big difference between him and Cristiano [Ronaldo] and the others. So, he deserves it," said Bochiche.
Although Messi did not have an outstanding year in terms of Barcelona titles, missing out on theChampions League and La Liga, he enjoyed a resurgence of form with Argentina, scoring 12 goals including his first two international hat-tricks.
Colombian tourist Benjamin Bernal said that Colombians admire the Argentine soccer icon.
Jose Riveros also felt the award was well-deserved.
"He deserves it. Nothing more, nothing less. He deserves it. If it wasn't him, who would it be?" said Riveros.
Jonathan Castellano, a young Colombian tourist, had no qualms about Messi's designation as the world's best soccer player.
"He is great, and Cristiano [Ronaldo] doesn't exist," said Castellano with a smile.
Messi was voted FIFA Player of the Year in 2009 before picking up the new-look award in 2010 and 2011 after it was fused with the Ballon d'Or award previously handed out by a France Football magazine.