As ticket prices for the U.S. Open tennis tournament soar, brands are staging NYC pop-ups for fans who can't make it out to Queens.

US Open Fan Week is a miracle. In a city where a rum and coke costs $20, hundreds of thousands of fans watch the world's best tennis players for free.

The U.S. Open sponsorships pivot from endorsement deals to immersive experiences changing the way brands market themselves to the biggest Grand Slam in tennis.