Some of mine:
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Kristen Faulkner breaking away for a surprise win in the cycling road race
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Julien Alfred breaking away for a surprise win in the 100 m
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Canadian men breaking away for a surprise win in the 4*100 m relay
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Armand Duplantis flying to a not-at-all surprising pole vault win
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Nika v Ami in breaking
(Bonus non-sport thing: Snoop Dogg himself doing the trois coups to open the women’s breaking event)
Carlos Yulo winning two gold medals for the Philippines (floor and vault in gymnastics)
Gabby Thomas 200 m win
Kaylia Nemour uneven bars gymnastics win