The last thing Novak Djokovic probably expected while signing autographs after his win at the Italian Open was to get hurt ... but that's exactly what happened -- as a flying water bottle from the stands nailed him in the head, leaving him crouching in pain.
Djokovic approached his supporters after a 6-3 6-1 win over France's Corentin Moutet on Friday ... and decided to show some love by scribbling his Hancock on some memorabilia.
Videos on X show Djokovic falling to the ground and grabbing his head after the water bottle struck him in the head.