Tennis Player Quits Match After Opponent Rubs Out Disputed Ball Mark

Zhang Shuai of China retired from a match against Hungarian player Amarissa Toth after a disputed line call.
Toth erased a ball mark with her foot during an argument over whether Zhang's shot was in or out.
Zhang was visibly upset by Toth's actions and suffered a panic attack before quitting the match.
Fellow tennis players criticized Toth's behavior and the tournament's response.
The Women's Tennis Association said it has zero tolerance for racism and is investigating the incident.