The new year is almost upon us, and there's a crop of young players ready to make even bigger marks on the world in 2020. Let's count down the Top 10 ATP and WTA youth to watch:

3

Stefanos Tsitsipas

Age: 21

Ranking: No. 6

The last few years have left some questions open as to who among the up-and-coming players could someday supplant the men's game's dominant stars.

With his booming serve, a flat forehand, and a one-handed backhand that'll please any aficionado, Stefanos Tsitsipas has made quite a compelling case for himself recently, spearheaded by his titles at the 2018 Next Gen Finals and 2019 ATP Finals, the latter he won while still Next Gen–eligible.

Though he hasn't made a Grand Slam final yet, he showed at the Australian Open and at Roland Garros this year that he can battle with the best, defeating Roger Federer in four sets and dueling Stan Wawrinka for five hours in the tightest match of the tournament.

“Guys, if you haven’t subscribed, please subscribe,” he said after making his first major semifinal, regarding his YouTube channel, which so far seems to be a bigger mental help than distraction.

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Tsitsipas showed promise at every level of tour in 2019, winning two ATP 250s and making the finals of the Madrid Masters and two ATP 500s, in addition to his season-ending championship.

He cracked the top 10 for the first time, in March, and finished the year at No. 6. Tsitsipas exits the Next Gen bracket for the 2020s as a nearly complete product, with the old guard looking over their shoulders.