Most passengers had been required to remove their footwear at checkpoints since 2006, a policy later eased only for members of trusted traveler programs.
Former Wimbledon champion Pat Cash says it is "ridiculous" that the chair umpire could not call the ball out when the automated line call system failed due to "human error" during Anastasia Pavlychenkova's win over Sonay Kartal.
British tennis player Emma Raducanu has cast doubt on the accuracy of Hawk-Eye calls in the tournament, saying she is disappointed in how "wrong" some calls have been.