The All England Club is blaming human error for a glaring mistake by the electronic system that replaced human line judges this year at Wimbledon.

CENTRE COURT, THE ALL ENGLAND CLUB — Anastasia Pavlyuchenkova suggested her British opponent may have received preferential treatment as simmering tensions around Wimbledon ’s use of electronic line calling (ELC) instead of line judges boiled over Sunday, when the technology malfunctioned at a crucial point on Centre Court.

Anastasia Pavlyuchenkova is not fond of grass courts, but the Russian tennis player registered a victory against the Japanese tennis sensation Naomi Osaka. Pavlyuchenkova has moved into the Wimbledon quarterfinals after nine years, defeating Osaka 3-6, 6-4, 6-4 en route. The majority of the crowd was cheering for Osaka.