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Nick first gained recognition as a tennis player when he made the Australian Open Boy's Final in 2006. He lost to French teenager Alexandre Sidorenko 6–3 7–6 (7–4).
In August 2006, Nick won his first official tournament, winning the Futures event in Australia F6. He beat fellow Aussie Sadik Kadir 2–6 6–4 6–4.
Nick won his second futures event in Indonesia F4 defeating Colin Ebelthite to retirement in the final.
Playing in his first official ATP match in the 2007 Thailand Open after qualifying and a ranking of 308 in the world, the Australian player caused a major upset defeating Sam Querrey of the United States, 59 in the world at the time, in the first round 2–6 6–4 6–3. Unfornately he couldn't replicate his form in the second round, losing to fellow qualifier Wang Yeu-Tzuoo 3–6 3–6. The event earned him $6,450 and 15 ATP points.
Nick has won 2 more Futures events on the Australian Kia Pro Circuit.
Nick won a wildcard into the 2008 Australian Open. His first round match was against Richard Gasquet on 14 January 2008, he lost the match 0–6 1–6 6–3 2–6.
After a successful 2009 campaign that had varied results on both the challenger and futures circuit Lindahl was able to raise his ranking to a career high of 229 but finished the year at 251. After the conclusion of the 2009 season Lindahl competed in an Australian Open Wildcard playoff tournament where he remained undefeated through the entire tournament and beat young gun Bernard Tomic in the final in five sets to claim a place in the main draw of the 2010 Australian Open.
He entered the qualifying draw for the 2010 Brisbane International. He was seeded eighth for the qualifiers and defeated Tobias Kamke 7-6(6) 7-6(6), Joel Lindner 6-7(5) 6-3 6-4 and no. 1 seed Xavier Malisse 6-1 7-6(2) to qualify. In the main draw, he lost to eventual semifinalist and fourth seed Tomáš Berdych 2-6 4-6 in the first round.
He was given a wildcard to the 2010 Medibank International Sydney and was defeated by Marcos Baghdatis 2-6 5-7.