Southern Force batted first and finished at 6/295.
Ben Bullimore smashed an unbeaten 107 runs off just 88 balls for the Force.
Bullimore was ably supported by Brad Davis (83) while Nosiana Pokana (2/63) and Norman Vanua (2/68) were the wicket-takers for the Barras.
In reply, the Barras got off to a steady start with Tony Ura (23) and Lega Siaka (30) taking the score to 3/79.
Captain, Assad Vala (57) and Sese Bau (75) put a century partnership for fourth wicket, shifting the momentum in the favour of the Barras.