Alexander Zverev received a warning for unsportsmanlike conduct at the Madrid Open after photographing a disputed line call during his second-round win against Alejandro Davidovich Fokina.
Zverev questioned the electronic system after a call went against him in the second set and took a picture of the mark, leading to the umpire’s warning.
Despite the controversy, the world number two won the match in three sets.
The incident highlights ongoing debate about electronic line-calling on clay, a surface traditionally relying on umpires checking ball marks.
This follows similar recent incidents involving Aryna Sabalenka and Victoria Azarenka.
Elsewhere in the tournament, Andrey Rublev lost, while Sabalenka advanced in the women’s draw.
