Player Challenges of Line Calls
In 2006, the US Open introduced instant replay reviews of calls, using the Hawk-Eye computer system sponsored by Chase. Each player is allowed three challenges per set plus one additional challenge during a tiebreak. The player keeps all existing challenges if the challenge is successful. If the challenge is unsuccessful and the original ruling is upheld, the player loses a challenge. Instant replay was initially available only on the stadium courts (Ashe and Armstrong), until 2009 when it became available on the Grandstand as well.
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. During the 2011 US Open, 29.78% of men's challenges and 30.2% of women's challenges were correct.
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.
Read more about this topic: U.S. National Championships (tennis)
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