Christopher McHugh/Damien Schumann, Australia (35) defeated Abubakarr Kamara/Lombie Patrick, Sierra Leone (38) 2-0 (21-8, 21-11).
It was the first FIVB World Tour meeting between the two teams.
Australia finishes in 2nd place in Pool K with a 2-1 record while Sierra Leone finishes 4th at 0-3. Italy's Daniele Lupo/Paolo Nicolai won the pool with a record of 3-0 and Oleg Stoyanovskiy/Artem Yarzutkin of Russia finished 3rd at 1-2.
Australia has advanced to the knockout phase and will play Wednesday, 2 August. Sierra Leone has been eliminated and finished 37th.