Jannik Sinner, the defending champion, opened with an unwavering spirit at the US Open, surmounting Australian Alexei Popyrin: 6-3, 6-2, 6-2, to advance.

Sinner broke serve early and maintained an excellent pace, soaking up Popyrin's big serves and dictating rallies with classical depth and precision. With very little to separate the players in the first set, Sinner moved up a few gears and allowed his opponents a glimpse of what awaited them over the next two sets. 

Even with his right foot taped, the Italian looked at home, belting winners from almost anywhere and serving like a beast. Winning a second match in a row within two hours only enhances Sinner's reputation as the man to beat in New York.

With every match, Sinner's title defense gains momentum and grows sharper in confidence as he heads on to the next round.