When Roger Federer made his triumphant tour of interview obligations after reaching the US Open quarter final, he did so wearing a tracksuit bearing the insignia of the Laver Cup.
As he prepares to face the resurgent Juan Martin Del Potro – and afterwards possibly Rafael Nadal - this was just another reminder of the extraordinary hold he continues to exert over the game at the age of 36.
The week after next in Prague he will help host the inaugural Laver Cup, a kind of tennis version of golf's Ryder/President's Cup, pitting the men of Europe versus the Rest of the World.
Roger Federer will help host the inaugural Laver Cup between Europe and Rest of the World
Federer celebrates after defeating Philipp Kohlschreiber to reach the US Open last eight
It is backed by the tennis federations of Australia and the USA plus Brazil's richest man, Jorge Paulo Lemann.
But the creators and chief driving force behind it are unmistakeably Federer and his management company.
As if he was not busy enough already, winning two Grand Slams this year. It is starting to look entirely plausible that, by the time he headlines his own event – it will be affected by the current glut of star injuries - he will do so as the holder of an astonishing three Grand Slam titles.
Having picked up from his sketchy form of the opening two rounds the Swiss will be the favourite on Wednesday night, because Del Potro will surely have some physical reaction to the magnificent five-set comeback that saw off sixth seed Dominic Thiem.
Federer set up a quarter-final meeting with Juan Martin del Potro at Flushing Meadows
Federer briefly needed off court treatment around the lower back/ buttock area during his fourth round win over the German. Interestingly, he was keen not just to emphasise its