The new US Open champion Stan Wawrinka has called for the public to be given more information about the medical time-outs that have become such a regular part of grand-slam tennis – and which brought a late edge of controversy to Sunday night’s final.

Wawrinka was irate when his opponent Novak Djokovic broke up the rhythm of play while trailing 3-1 in the fourth set, claiming that he needed treatment on a toe injury. The rules say that you should wait for the changeover – which would have one game later - unless you have an “acute” problem. But Djokovic invited accusations of gamesmanship by calling play to a halt for seven minutes before Wawrinka was due to serve.

“I was just surprised with the timing,” said Wawrinka on Monday at a morning-after photocall on top of Manhattan’s Rockefeller Center. “Normally you don’t take it before your opponent is going to serve.