He moved to the United States to further his baseball career after debuting with the Victoria Aces in the 2003 Claxton Shield.

In 2009, Berg hit just .210 in 60 games between New Britain and Fort Myers, and was designated for assignment.

On 24 July, he signed with the Grand Prairie AirHogs of the independent American Association.

Berg starred in the Claxton Shield 2008, hitting .400/.429/.750 with 3 home runs, second to Olympic Silver Medalist Tom Brice.

Daniel was selected for the Australian national baseball team in the 2008 Final Olympic Qualification Tournament and played regularly, batting .308/.367/.462 with seven runs in seven games.