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David Goodwillie began his professional football career in 2006 with Dundee United, after progressing through the club's youth system. He made his first-team debut in the Scottish Premier League on 27 August 2006, coming on as a substitute in a 1–0 win over St Johnstone. He scored his first goal for the club on 30 October 2006, in a 3–2 win over Hibernian.