The unwritten rule in professional tournaments? Do not hog the practice court. But as leading players testify – the reality is very different

On a cool Wednesday afternoon before the US Open last year, Daniil Medvedev and Alexander Zverev were busy fine-tuning their games in an intense practice set at Louis Armstrong Stadium. Danielle Collins and Christian Harrison, semi-finalists in the mixed doubles tournament, were scheduled to take their place at the hour and the American pair duly arrived a couple of minutes before their allotted slot.

An amusing scene soon unfolded. Medvedev and Zverev were clearly desperate to continue playing for a little longer, but their court time had run out. The pair began to sheepishly deliberate over whether to attempt to play another game, even lining up on the baseline again, and they still occupied the court past the hour. Finally, they admitted defeat, allowing Collins and Harrison, who had been standing quietly on the sidelines, to begin.