Jannik Sinner and Aryna Sabalenka seek to defend their titles at the US Open, starting in New York.

The US Open tennis tournament has begun, with Jannik Sinner and Aryna Sabalenka aiming to defend their titles. Winning back-to-back US Open championships is uncommon, adding pressure and excitement to their quests. Both players will face tough competition from other top-ranked athletes as they seek to repeat their previous year's success.