Born Bradley Christopher Harman, he signed with the Phillies organisation in 2003 and debuted with the GCL Phillies the next year. At the end of the season he led shortstops with a .928 fielding percentage. Later that year he played for the Australian under-19 national team.

Harman starred in the 2005 Claxton Shield, winning both the Gold Glove Award and Helms Award as the MVP of the tournament while leading the New South Wales Patriots to the title.

In 2005, Harman averaged .303 for the Lakewood BlueClaws. In his debut for the Australia national baseball team, he hit .333 in the 2005 Baseball World Cup, playing error-free ball in six games at shortstop; he split time at short with Rodney van Buizen in his debut tournament with the senior team.

In 2007, Harman hit .281 for Clearwater with 13 home runs. In the 2007 Baseball World Cup, he batted .275 and scored 11 runs in 10 games for Australia. He was one run behind the tournament leader, teammate Trent Oeltjen. Harman scored the 7th-inning go-ahead run against the Cuban national team in a game Australia lost, 3–2, in 10 innings. Harman sparked the winning rally in the bottom of the ninth inning against the Dutch national team closer Michiel van Kampen. Against Team Canada, Harman doubled in Luke Hughes with the go-ahead run in the 9th inning.

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