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Joseph Gordon-Levitt, Niko Kovac

AP Photo/Darko Bandic; Tim P. Whitby/Getty Images

Joseph Gordon-Levitt was the star of the opening day of the 2014 FIFA World Cup ... on Twitter.

Scores of fans watching Brazil's national soccer team take on Croatia's on Thursday, June 12, all noticed the name thing—the striking resemblance between the 33-year-old actor and Croatia's head coach Niko Kovač, 42.

Frequent tweets about the doppelgängers, in several languages, spurred the Inception star's name to trend on Twitter, while photos of the two, or just Kovač alone, popped up while searching for it.

Gordon-Levitt is playing a European in his newest film—the actor is currently filming To Reach The Clouds, in which he portrays a French high-wire artist. Maybe a biopic about a Croatian soccer team coach is next? And if he's looking for a body-double ...

The World Cup kicked off earlier this day with a star-studded opening ceremony and performances from the likes of Jennifer Lopez and Pitbull.