Alexander Zverev defeated Learner Tien in the Australian Open quarter-final on hard court, winning 6–3, 6–7, 6–1, 7–6 as the pre-match favourite. The German top seed controlled much of the encounter, claiming the first set comfortably and reasserting dominance in the third. Tien offered resistance in the second and fourth sets, forcing both to tiebreaks, but Zverev's experience proved decisive in the decisive moments. The result maintains Zverev's strong form at Melbourne and keeps him on course for a deep run in the tournament.