Katie Ledecky.Photo: AP Photo/Morry Gash

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Mariia Temnikova

Temnikova competes for the Russian Olympic Committee in the second women’s 200m breaststroke semifinal.
02of 13Michael AndrewMichael Andrew.Alexander Hassenstein/Getty ImagesTeam USA’s Andrew swims in the men’s 200m individual medley semifinal.
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Michael Andrew
Michael Andrew.Alexander Hassenstein/Getty Images

Team USA’s Andrew swims in the men’s 200m individual medley semifinal.
03of 13Zhang YufeiZhang Yufei.ODD ANDERSEN/AFP via Getty ImagesYufei of China wins gold in the women’s 200m butterfly.
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Zhang Yufei
Zhang Yufei.ODD ANDERSEN/AFP via Getty Images

Yufei of China wins gold in the women’s 200m butterfly.
04of 13Caeleb DresselCaeleb Dressel.AP Photo/Morry GashDressel, of the United States, swims to victory inthe men’s 100m freestyle final.
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Caeleb Dressel
Caeleb Dressel.AP Photo/Morry Gash

Dressel, of the United States, swims to victory inthe men’s 100m freestyle final.
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Champion Yufei during her gold medal-winning race.
06of 13Katie LedeckyKatie Ledecky.AP Photo/Morry GashTeam USA superstar Ledecky swims the last leg of the women’s 4x200m freestyle relay raceto win silver.
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Katie Ledecky
Katie Ledecky.AP Photo/Morry Gash

Team USA superstar Ledecky swims the last leg of the women’s 4x200m freestyle relay raceto win silver.
07of 13Allison SchmidtAllison Schmidt.AP Photo/Morry GashSchmidt helps her U.S. teammates to the silver medal in the women’s 4x200m freestyle relay.
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Allison Schmidt
Allison Schmidt.AP Photo/Morry Gash

Schmidt helps her U.S. teammates to the silver medal in the women’s 4x200m freestyle relay.
08of 13Keita SunamaKeita Sunama.Al Bello/Getty ImagesTeam Japan swimmer Sunama competing in the men’s 200m backstroke semifinal.
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Keita Sunama
Keita Sunama.Al Bello/Getty Images

Team Japan swimmer Sunama competing in the men’s 200m backstroke semifinal.
09of 13Chase KaliszChase Kalisz.AP Photo/Morry GashKalisz, of the United States, swims in the men’s 200m individual medley semifinal.
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Chase Kalisz
Chase Kalisz.AP Photo/Morry Gash

Kalisz, of the United States, swims in the men’s 200m individual medley semifinal.
10of 13Tatjana SchoenmakerTatjana Schoenmake.AP Photo/Morry GashSouth African athlete Schoenmaker swims next to Team USA’s Annie Lazor and the ROC’s Evgeniia Chikunova during the women’s 200m breaststroke semifinal.
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Tatjana Schoenmaker
Tatjana Schoenmake.AP Photo/Morry Gash

South African athlete Schoenmaker swims next to Team USA’s Annie Lazor and the ROC’s Evgeniia Chikunova during the women’s 200m breaststroke semifinal.
11of 13Evgeny RylovEvgeny Rylov.OLI SCARFF/AFP via Getty ImagesThe ROC’s Rylov competes in the men’s 200m backstroke semifinal.
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Evgeny Rylov
Evgeny Rylov.OLI SCARFF/AFP via Getty Images

The ROC’s Rylov competes in the men’s 200m backstroke semifinal.
12of 13Caeleb DresselCaeleb Dressel.AP Photo/Morry GashDressel dives into a gold medal in the men’s 100m freestyle final.
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Dressel dives into a gold medal in the men’s 100m freestyle final.
13of 13Luke GreenbankLuke Greenbank.Al Bello/Getty ImagesGreenbank of Team Great Britain competes in the men’s 200m backstroke semifinal.
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Luke Greenbank
Luke Greenbank.Al Bello/Getty Images

Greenbank of Team Great Britain competes in the men’s 200m backstroke semifinal.
source: people.com