At the U.S. Open, the players are the stars. Their coaches are the ad boards.‎

NEW YORK — It’s probably fitting that in the world’s economic and marketing capital, a Grand Slam tennis tournament doubles as one giant product-placement opportunity. Little-known players who play on stadium courts end up with last-minute patches stuck onto their kits. Their lesser-known coaches wear hats from brands such as the IT company Infosys and the used-car retailer Carvana. The week before the U.S. Open is a strange mélange of tennis-related activations. Aryna Sabalenka appears at a Bro