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Lukas Hellum Lilleengen (born 15 November 2000) is a Norwegian tennis player. Hellum Lilleengen has a career high ATP singles ranking of 1080 achieved on 29 August 2022. He also has a career high ATP doubles ranking of 1257 achieved on 3 October 2022. Hellum Lilleengen represents Norway at the Davis Cup, where he has a W/L record of 1–1.