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:
1
Jannik Sinner
Age: 18
Ranking: No. 78
Jannik Sinner ended his 2019 the way he began it: unglamorously. His season-long whirlwind started with three consecutive ITF tournaments in Monastir, Tunisia, and finished at an ATP Challenger at home in Italy.