Female Tennis Player, US Open 2011

Once a challenge is made, the official review (a 3-D computer simulation based on multiple high-speed video cameras) is shown to the players, umpires, and audience on the stadium video boards and to the television audience at the same time. The system is said to be accurate to within five millimetres.
During the 2006 US Open, 30.5% of men's challenges and 35.85% of women's challenges were overturned. During the 2007 US Open, 95 challenges were overturned - or 30.6%.
In 2007, JP Morgan Chase renewed its sponsorship of the US Open. As part of its sponsorship arrangement, Chase renamed the tournament's replay system the "Chase Review" on in-stadium video and television.