U.S. National Championships may refer to;
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United States national amateur boxing championships
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United States Figure Skating Championships
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U.S. National Championships (tennis)
The US Open Tennis Championships is a hardcourt tennis tournament held annually in Queens, New York. Since 1987, the US Open has been chronologically the fourth and final Grand Slam tournament of the year. The other three, in chronological orde ...
, before 1968, the tennis tournament now called the U.S. Open
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USA Gymnastics National Championships
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USA Outdoor Track and Field Championships
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