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![Electronic line calling to be used on every court at 2018 US Open - Official Site of the 2023 US Open Tennis Championships - A USTA Event Electronic line calling to be used on every court at 2018 US Open - Official Site of the 2023 US Open Tennis Championships - A USTA Event](https://photo-assets.usopen.org/images/pics/large/f_USTA801973_20170903_DCY_9166.jpg)