Igor Juri (@lojzija), a Twitter user, tweeted a video of a man kicking and slapping a young player during a training session at an unidentified court in Serbia over the weekend.
He then pulled her by the hair and pushed her to the ground, where he continued to kick her.
"Another shocking act of fatherly assault towards daughter. I learned that a Chinese family was traveling there. Additionally, we'll bring criminal proceedings against this monster, Juri wrote.
Pam Schriver, a former US Open semifinalist and commentator, vented her indignation on Twitter and urged Novak Djokovic, a 21-time Grand Slam champion, to investigate the event.
She said, "OMG we all need to report and file charges against this kind of heinous behavior.
"Let's request behind-the-scenes assistance from @DjokerNole. To end abuse, we must all cooperate. Igor, thank you for contributing.