Bencic secured a 6-0 7-5 victory, with the first set lasting only 26 minutes.
Despite a challenging start, Boulter, supported by the crowd, put up a more competitive fight in the second set, breaking Bencic's serve to level at 4-4, but her comeback quest fell short.
Boulter, who had a difficult 2025 and recently hired a new coach, had set low expectations for the match against the strong opponent.
Bencic, returning to the world's top 10, continued her strong start to the season, having won five matches in a row before the tournament.