The United States Open tennis tournament, already one of the most glamorous sporting events in the world, will become even fancier after an $800 million renovation that will be the largest single investment in the site’s history.

Tennis fans will see some of the transformations in Arthur Ashe Stadium, in Flushing, Queens, where the tournament in held, while other parts will be off limits to them — unless they grow up to be tennis stars.

The project includes an overhaul of Ashe Stadium, the centerpiece of American tennis, which will add shine and much-needed walking space to a concrete and steel building that can feel cramped and sweaty on the busiest match days.

The other part is an opulent new building for the players that will feature state-of-the art training facilities, luxury accommodations and cafes.

Construction, which has already begun, is scheduled to be completed in time for the 2027 U.S. Open. The United States Tennis Association, which runs the tournament, said work would not interfere with the tournament over the next two years.

“We are doubling down on the continued growth that we are seeing in tennis in this country,” said Danny Zausner, the association’s chief operating officer, who helped unveil the renovation at a news conference on Monday.