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Zverev Warned After Challenging Electronic Line Call at Madrid Open

Debate over electronic line-calling on clay intensifies as Zverev and other players voice concerns about system accuracy.

Germany's Alexander Zverev takes a picture with his mobile phone of the ball mark on the court after he disputed the referee decision during his match against Spain's Alejandro Davidovich Fokina during their 2025 ATP Tour Madrid Open tennis tournament third round singles match at the Caja Magica in Madrid, on April 27, 2025. (Photo by Thomas COEX / AFP) (Photo by THOMAS COEX/AFP via Getty Images)
Tennis - Madrid Open - Park Manzanares, Madrid, Spain - April 27, 2025 Germany's Alexander Zverev in action during his round of 32 match against Spain's Alejandro Davidovich Fokina REUTERS/Juan Medina
Tennis - Madrid Open - Park Manzanares, Madrid, Spain - April 27, 2025 Germany's Alexander Zverev reacts during his round of 32 match against Spain's Alejandro Davidovich Fokina REUTERS/Juan Medina
Tennis - Madrid Open - Park Manzanares, Madrid, Spain - April 27, 2025 Spain's Alejandro Davidovich Fokina in action during his round of 32 match against Germany's Alexander Zverev REUTERS/Juan Medina

Overview

  • Alexander Zverev received a warning for unsportsmanlike conduct after photographing a disputed ball mark during his Madrid Open match.
  • Zverev alleged a malfunction in the electronic line-calling system, citing discrepancies between the call and the visible ball mark.
  • Other players, including Aryna Sabalenka and Victoria Azarenka, have also criticized the system, sharing disputed calls on social media.
  • Concerns stem from the variable nature of clay surfaces, which some argue complicates accurate automated readings.
  • The French Open has confirmed it will retain human line judges, diverging from the ATP and many WTA clay-court events this season.