Former University of Wisconsin swimmer Adam Mania competed for Poland in the 2004 Olympic Games.
He'd liked to compete in the 2008 games as well, but this time for the United States.
The Shorewood resident's dual citizenship gives him that option, if he can qualify.
Mania broke the U.S. Open record in the 50-meter backstroke earlier this month at the Conoco USA National Swimming Championships in Indianapolis.
The 23-year-old is ranked eighth in the world in the 50 backstroke, which is not an Olympic event, and 25th in the 100 backstroke.
His parents fled Poland when he was an infant.