Djokovic said his performance in Friday's Australian Open semifinal loss to Jannik Sinner was "one of the worst" in more than 400 Grand Slam matches.
The 22-year-old Sinner, who reached the final of a Grand Slam tournament for the first time in his career, defeated Djokovic in straight sets 6-1, 6-2, 6-7(6) and 6-4.
"He completely outplayed me today," Djokovic said about his encounter with Sinner.
The Serbian tennis star, who has 24 Grand Slam titles, said he still has high hopes for more success in the rest of the season.
Jannik Sinner ended the semi-final streak of 10-time champion Novak Djokovic at the Australian Open.
Djokovic had previously won all 10 semifinals and 10 finals at Melbourne's Rod Laver Arena.
Sinner's victory also ended Djokovic's 33-match winning streak at the Australian Open, dating back to 2018.
"I don't know, ask him," Sinner said after the match when asked what has been troubling Djokovic the last few matches.
With Novak Djokovic's defeat, the upcoming Australian Open final will be the first Australian Open final without Roger Federer, Rafael Nadal or Djokovic since 2005.