She owns the world record in the 400, 800, and 1,500 meter freestyle races, and since 2013 she’s been breaking and re-breaking those records at a rate that’s made her completely untouchable.
She claimed the 800 world record at the World Championships in 2013, and has re-broken it three times since then, lowering her time by just over six seconds in the process.
She also set the world record in that race at the Worlds Championships in 2013, and has since shaved 11 seconds off her time while re-breaking the record on four occasions.
She claimed the world record in the 400 at the USA Championships in 2014, and then broke it again a few weeks later at the Pan Pacific Championships.
Nobody will touch her in the 800, and the only thing that could prevent her from setting another world record is all the seconds she’s already shaved off her time since 2013.