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In 2008, he began the season 1-4 with 5 saves and a 4.22 ERA, fanning 48 in 42 IP. Walsma was added to the Dutch national team for the 2008 Haarlem Baseball Week. He allowed one run in 6 IP in the event. He then was selected by coach Robert Eenhoorn in the team that represents the Netherlands at the 2008 Summer Olympics in Beijing.