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The three-time Olympic champion will need to shave more than 7 seconds off her personal best, a record she set two years ago. But if she succeeds, the Kenyan won't make the history books just yet.
(Image credit: Adek Berry)

The three-time Olympic champion will need to shave more than 7 seconds off her personal best, a record she set two years ago. But if she succeeds, the Kenyan won't make the history books just yet.
(Image credit: Adek Berry)