Fritz and Sabalenka reach semis as Anisimova advances at Wimbledon

Tournament organisers were forced to apologise and make a change to the system to avoid further issues after a major error in Sonay Kartal's fourth-round defeat to Anastasia Pavlyuchenkova in the women's draw

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Wimbledon’s controversial line technology system malfunctioned again as Taylor Fritz beat Karen Khachanov to reach his first Wimbledon semifinal, while world number one Aryna Sabalenka survived a scare to make the last four on Tuesday.

Swedish umpire Louise Azemar Engzell had to stop a point in the opening game of the fourth set on Court One when “fault” was incorrectly called after a Fritz forehand landed well inside the baseline.

The call of “fault”, rather than “out”, and positioning of the ball suggested the system was still tracking Fritz’s serve as opposed to a rally and the point had to be replayed.

Tournament organisers were forced to apologise and make a change to the system to avoid further issues after a major error in Sonay Kartal’s fourth-round defeat to Anastasia Pavlyuchenkova in the women's draw.

On that occasion, the new system failed to call out when a shot by Kartal landed well behind the baseline.

A fully automated system has replaced human line judges at Wimbledon for the first time this year, in line with the Australian Open and the US Open.

The latest blunder did not stop American fifth seed Fritz advancing after another hard-fought 6-3, 6-4, 1-6, 7-6 (7/4) win over Russian 17th seed Khachanov.