The commute, the fight for court time and the sponsorship commitments make the life of a tennis player demanding during this tournament.
When Mackenzie McDonald dueled Félix Auger-Aliassime for three and a half hours in the opening round of the U.S. Open, fans were only seeing a glimpse of the time McDonald put in toward his surprise win on Monday.
For both players, and hundreds of others at the sprawling tournament, a match day extends well beyond a warm-up and the contest itself.