Surprise wins and misses dominated the Olympic storyline on Sunday as new champions from unlikely nations joined traditional powerhouses atop medal podiums and stars faltered.
Tunisia's Ahmed Hafnaoui not only stunned swimming superpowers with his gold medal performance in the 400m freestyle — he didn't quite believe the result himself.
The first world record fell in the pool when Australia won the 4x100 women's freestyle relay Olympic gold for the third time in a row. The quartet of sisters Bronte and Cate Campbell, Meg Harris and Emma McKeon took 0.36 seconds off their previous best.
American Chase Kalisz won his country's first gold
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