Alex de Minaur cruised past Emil Ruusuvuori to seal a 2-0 win for Australia over Finland and send Lleyton Hewitt's team through to a second successive Davis Cup final.
De Minaur won 6-4 6-3 to set up a meeting with Serbia or Italy on Sunday.
"For us this cup is a priority. We do everything we can to represent Australia, with pride and passion," said the world number 12.
Alexei Popyrin beat 7-6 (7-5) 6-2 Otto Virtanen in the first singles rubber.
The captains agreed not to play the doubles rubber after Australia's victories in the singles contests.