Alex de Minaur sent a warning to tennis bosses after losing early in Paris, with some of his fellow players also voicing their concerns.

A fatigued Alex De Minaur crashed out of the French Open and called for the tennis calendar to be shortened, warning that a failure to take action soon could result in players burning out physically and mentally.

Australia's Alex de Minaur says the men's tennis calendar is too full following his shock exit from the French Open.