When Andy Murray speaks, the majority of the tennis world listens. And his anger towards Stefanos Tsitsipas for taking too long at the toilet during matches has seemingly contributed to a prospective rule change.
Timed toilet trips - ones which take less than it does for "American billionaire Jeff Bezos to fly into space", as Murray famously described Tsitsipas' bathroom break at the US Open - was one of the new rules implemented at last week's ATP Next Gen Finals.
Shorter warm-ups and courtside coaching were also trialled at the event, where eight of the world's best male players aged under 21 do battle across five sets - but where each set is won by the first player to win four games.