Before his first round victory, Djokovic has not competed since losing to Jannik Sinner in early July.
“I wish I felt the deeper I felt about the game,” Djokovic said.
“This has obviously been a little different over the past few years.
“I wear out faster than ever before, so I have to deal with that, a lot of recovered things can make myself perform at the highest level.”
Playing on Arthur Ashe Stadium in the morning – an unfamiliar time period for players who are used to the night of the event racing race – Djokovic seems to stand out in the bright sunshine.
The Seventh Seed looked tired in his first round and seemed to be hampered by similar issues early on against Home Hope Svajda.
World No. 145 in the world posted a video before the game, which was his excitement about playing Djokovic, but he showed no signs of being overly bored, keeping his nerves in the gods challenged the first set.
But Djokovic, as he often does, responded immediately, and when Svajda fought against cramps, there were 11 of the last 12 games.
Earlier, seed 21 Tomas Machac Brazilian star Joao Fonseca stood out in the 7-6 (7-4) 6-2 6-3 match.
The 19-year-old Fonseca had a fixed view in the opening match, backed by a lively fan base in the stands court, but Machac was determined to win.
His Czech compatriots and the 20th seed Jiri Lehecka It also made progress by defeating Argentina’s Tomas Martin Etcheverry 3-6 6-0 6-2 6-4.
