Just didn't feel good at all, nerves were there.
"I was not even supposed to be here because of the surgery that was only five, six weeks ago", said Djokovic.
"But he's strong enough to deal with that, and I love him and I want to see him in the top positions very soon".
Japan's world No. 109 Taro Daniel pulled off a major upset Sunday at the BNP Paribas Open by beating Serbia's Novak Djokovic in the second round.
Thiem has already won a tour-leading 17 matches this season, but he had to work hard to beat 19-year-old Tsitsipas, who reached the quarter-finals in Dubai last week and is ranked 71st in the world.
"He obviously wasn't in his top form, so I was able to take advantage of it", Daniel said. "She's the best player I have ever played, and it was the biggest court I have ever played on".
Bulldog reportedly dies in overhead bin on United Airlines flight
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Still looking to adjust to the high-bouncing conditions in the desert, Federer will look to improve on his 40 unforced errors when he faces 25th-seed Filip Krajinovic in the third round.
Reigning World No.1 Roger Federer of Switzerland completed his match against Argentina's Federico Delbonis, suspended a day earlier, and advanced to the third round of the Indian Wells tennis tournament with a 6-3, 7-6 (6) win.
Federico was off to a better start in set number two, holding easily in the opening two service games to be leveled at 2-2 before the rain started to fall, forcing the organizers to call it a day and move the match into Sunday's program.
"It's been a long time since I have been interrupted at night and have to come back the next day", Federer said. It was actually quite interesting.
Djokovic was defeated by the enthusiasm of his rival, who did not miss the unique opportunity to win the game during the first time they played against each other.
American Amanda Anisimova took down two-time Wimbledon champion Petra Kvitova 6-2, 6-4 in a match lasting just over an hour to become the first 16-year-old to move into the fourth round at Indian Wells since Viktoriya Kutuzova in 2005.