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How does the umpire know which ball mark to check in clay court tennis? | Tennis | The Guardian
Chair umpire look at mark on hard tennis court and says ball was IN Stock Photo | Adobe Stock
Are tennis players at the French Open allowed to scrape the mark where the ball landed? | French Open | The Guardian
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BallTrace - Tennis Ball Marker. Great tennis gift!
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BallTrace - Tennis Ball Marker. Great tennis gift!
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French Open: Ball Marks, Not Instant Replays, Are Final Word - The New York Times
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Tennis Australia - #CHALLENGE | The ball mark is on the deuce court service line from a flat serve to the body. Must touch the line to be in. So, would you
