Novak Djokovic delivered a lesson in Grand Slam tenacity to Learner Tien in the first round of the U.S. Open on Sunday, battling past the American teenager 6-1 7-6(3) 6-2 to launch his latest quest for a record 25th major title.

Novak Djokovic will open his US Open campaign against the USA's Learner Tien, the 19-year-old known as a giant killer. Djokovic is bidding for his record 25th Major as he looks to make his impact in the US Open 2025.

Novak Djokovic’s first match at the US Open was a bit of a litmus test for the Serbian legend because he didn’t play a hardcourt warm-up tournament coming into the year’s final Grand Slam. The 24-time Grand Slam champion said he didn’t play the Cincinnati Open because he prefers to focus on the Grand Slams at this stage of his career.