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Brett Roneberg (born February 5, 1979 in Sandringham, Victoria) is an Australian baseball player in the Pittsburgh Pirates organization, playing for their Double-A affiliate, the Altoona Curve.
In 2004, he was part of the Australian Olympic baseball team, who achieved a Silver Medal in the baseball tournament at the Athens Olympics.
In the 2009 World Baseball Classic, Roneberg led the tournament in batting average (.714), slugging percentage (1.286) and on base plus slugging (2.036).