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An 'upset' in sport is when a lower-ranked or less-favoured competitor beats a much higher-ranked or expected winner. These moments are thrilling because they defy expectations, proving that anything can happen on the day. Zheng Qinwen, ranked 121st, beating the six-time Grand Slam champion Iga Swiatek is a classic example of an upset, adding drama and unpredictability to the tournament.
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