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She’s only 17, and she’s never competed at an Olympics, but Chloe Kim is one of the athletes at this Winter Games whom everyone is watching.

Born in Long Beach to Korean immigrants, Ms. Kim started snowboarding before most kids learn to read. At age 4 she began taking trips to Mountain High with her father, Jong Jin Kim, where, together, they learned to navigate the slopes.

“We both had no idea what we were doing,” she’s conceded.

That didn’t last long.

Ms. Kim won three gold medals at the X Games, all before age 16. She qualified for the Sochi Olympics but didn’t go, because, at 13, she was too young.

Then, in 2016, Ms. Kim became the first woman to land back-to-back 1080s in competition. (Yep, that’s three full rotations on one side of the halfpipe followed by three more on the other.)