Alexander Zverev defeated Thiago Monteiro 6-4, 6-4 in a round-robin match at the United Cup on hard court. The German top seed controlled the encounter with consistent serving and baseline play, breaking Monteiro's service twice in each set to secure a straightforward victory. Monteiro, ranked considerably lower, offered limited resistance against Zverev's superior court positioning and shot-making. The result underscores Zverev's status as a leading contender in the early-season ATP 250 event as he progresses through the group stage with a dominant performance.