Adam Supyk stunned the crowd after scoring the lone goal in the 63rd minute.
The team secured the crucial three points in the league.
Bula FC made several other attempts to score in the second half, but luck did not go their way.
Many fans turned out to support Fiji’s first-ever professional club, Bula FC, as the team played in Ba for the first time.
Auckland FC is leading the table with 26 points, followed by South Melbourne FC with 19 points.
Bula FC will play South Melbourne FC on Wednesday at 7pm.
