Jannik Sinner defeated Gabriel Diallo 6–2, 7–6 in the first round of the Cincinnati Masters on hard court, confirming his status as a heavy pre-match favourite at odds of 1.05. Diallo, who entered at 14.5, offered limited resistance in the opening set, surrendering it decisively. The second set proved more competitive, with Diallo pushing Sinner to a tiebreak, though the Italian ultimately prevailed in that deciding contest. The result underscores Sinner's commanding form at the Masters 1000 level and his continued trajectory as one of the tour's elite performers heading into the latter stages of the season.