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In/Out: The Portable Ready-to-Use Line Call Device
A yellow tennis ball being shown as out, just beyond the base line on an asphalt tennis court Stock Photo - Alamy
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Tennis court ball in / out , ace / winner Stock Photo - Alamy
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If the tennis ball overhangs the line yet first point of ground contact is outside the line, is the ball in or out? - Quora
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In/Out: The Portable Ready-to-Use Line Call Device
