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.

Amanda Anisimova collapsed flat on her face in sheer relief after she survived an astonishing and unexpected fightback from Anastasia Pavlyuchenkova to secure a 6-1 7-6(9) victory and reach the Wimbledon semi-finals for the first time.