December 21, 2015 2:15 PM EST

Auston Matthews

The 18-year-old is already dominating Switzerland’s top league. He’s a lock for the No. 1 NHL draft pick in June.

Corey Seager

Last season the L.A. Dodgers shortstop hit .337 in the 27 games he played with the club. He’ll be a Rookie of the Year favorite.

Holly Holm

What comes after knocking out champ Ronda Rousey? A planned rematch.

Joey Bosa

The NFL draft lacks a can’t-miss QB prospect, which opens the door for Ohio State’s Bosa at No. 1.

Madison Keys

The 20-year-old American went far at Wimbledon and finished the year ranked No. 18. Expect her to rise.

This appears in the December 28, 2015 issue of TIME.

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Write to Jack Dickey at jack.dickey@time.com.

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