Sinner gave his opponent one set, but started with a win at the US Open

World No. 1 Jannik Sinner began his US Open campaign with a victory.

The Italian's opponent was American tennis player Mackenzie McDonald, who is ranked 140th in the ATP rankings.

Surprisingly, the underdog took the first set (6-2). Jannik leveled the match in the second set (6-2).

In the third set, the Italian confidently took control (6-1), and then comfortably secured his place in the next round, showcasing his class (6-2). The match lasted around 2.5 hours.

During the match, the favorite committed 5 double faults and converted 8 out of 15 break points.

In August, Sinner won the Cincinnati tournament. Earlier this year, Jannik also claimed the Australian Open title.

The Italian has a chance to become only the fourth player in history to win two hard-court Grand Slam tournaments in a single season.

In the second round, Sinner will face another American, Alex Michelsen.

• US Open, 1st Round
  Jannik Sinner - Mackenzie McDonald 3:1 (2-6, 6-2, 6-1, 6-2)