Just ask our #USOpen⁠ ⁠champions, there's no substitute for hard work. Happy #LaborDay! Inspiration: Lunch atop a Skyscraper, 1932 #nycskyline #marincilic #sloanestephens #novakdjokovic #serenawilliams #rafaelnadal #mariasharapova #rogerfederer #juanmartindelpotro