The U.S. Open, which pioneered the use of video replay in 2006, will become the first Grand Slam tournament to install electronic line calling capabilities for every match later this summer.
All 16 competition courts will have Hawk-Eye technology, more than doubling the seven served last year. In 2017, Hawk-Eye was only available on the four main courts (Arthur Ashe Stadium, Louis Armstrong Stadium, Grandstand, and Court 17) and Courts 5, 10, and 13.
The latter three relied on a dedicated replay room inside Arthur Ashe, a centralized system mimicking those now used by MLB, the NFL, and the World Cup, among others.