Japanese qualifier Taro Daniel sent five-time tournament champion Novak Djokovic tumbling out of the Indian Wells Masters with a hard-fought 7-6 (7/3), 4-6, 6-1 victory on Sunday.
It was another snag in the return for the 30-year-old Djokovic who was playing in just his second event of 2018.
He is making a cautious return to the ATP Tour after stopping his 2017 season following Wimbledon, due to a right elbow injury.
Djokovic scrambled to win the second set but looked rusty on stadium court, making 62 unforced errors compared to 29 for Daniel.
Djokovic had four aces but overall he served poorly making four double faults and winning just 65 percent of his first-serve points.
Taro Daniel of Japan
Daniel, who is ranked 109th in the world, advanced to the third round where he will face Gael Monfils of France who outlasted American John Isner 6-7 (5/7), 7-6 (7/3), 7-5.