Tennis
In which year did Nicolas Kiefer win the Australian and U.S. Open Junior's tournaments?
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Who is the Serbian tennis star that won the 2016 ATP World Tour Masters 1000 Madrid?
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Which tennis term is defined as "an invalid service attempt"?
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Where did David Ferrer capture his first ATP tennis title?
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What round did Sloane Stephens lose at the 2018 Wimbledon Championships?
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Which athlete is known for their accomplishments in tennis?
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What Grand Slam event did Serena Williams and Venus Williams win in 2016?
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