Wimbledon organizers have apologized and explained that “human error” was the reason behind the electronic line-calling system being turned off during a match on Sunday.

While a ball landed well behind the line, the system failed to react. This led to complaints from Pavlyuchenkova, who felt wronged on a game point during a service game she ultimately lost. The BBC relayed the All England Club's explanations,

Sonay Kartal was knocked out of Wimbledon after her Russian rival claimed the British player got special treatment when the electronic line calling failed on Centre Court. Anastasia Pavlyuchenkova, 34, recovered to knock the last British female out of the singles 7-6 6-4.