Arthur Ashe Stadium, named after the winner of the inaugural US open in 1968, is the largest tennis-specific stadium in the world, holding 23,771 people. When constructing the new steel retractable roof, unveiled for the 2016 US Open, UBS used more than 2,000+ scaffold frames, completely encircling the stadium’s perimeter. A specialized weather forecast crew will predict when rain is on the way, but the tournament director will make the final call on whether or not to close the roof, which takes 5 to 7 minutes.