Novak Djokovic, who was famously defaulted at the US Open after he accidentally hit a ball which felled a line judge, on Saturday demanded that the officials be replaced by machines. In New York, the world number one was disqualified after swiping at a ball in frustration which then smashed into the throat of a lineswoman standing behind him.

The incident happened on the showpiece Arthur Ashe Stadium, one of just two courts at the tournament which maintained the tradition of using linesmen and women. On all the others, electronic line calling was used as part of plans to reduce the number of people on the Flushing Meadows site during the coronavirus pandemic. There have been growing calls for a similar system to be introduced at Roland Garros which still relies of officials making rulings with the naked eye. Djokovic believes it's time for a rethink.