Learner Tien defeated Camilo Ugo Carabelli 7–6, 6–3 in the first round of the ATP 250 Brisbane tournament on hard court on 4 January 2026. Tien, the pre-match favourite at odds of 1.2, delivered a composed performance to overcome the Argentine qualifier despite a competitive opening set that went to a tiebreak. The American secured the first set at 7–6 before dominating the second to close out the match in straight sets. Carabelli, a 5.21 outsider, showed resilience early but could not sustain the intensity required against his seeded opponent. The victory consolidates Tien's early-season form and sets up a second-round encounter in Brisbane.