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We're answering the 10 biggest questions on the WTA and ATP tours in 2020. The entire list will be rolled out here.

Plenty of young talent provided hope for the future in 2019, before Jannik Sinner burst onto the scene with a massive push. The Italian began the year ranked No. 549, but after turning 18 in August, he rocketed inside the Top 100 and won the Next Gen ATP Finals.

Twenty 2020 Questions: The best ATP player you may be unfamiliar with?

Twenty 2020 Questions: The best ATP player you may be unfamiliar with?

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Sinner’s gangly frame, and hair with a personality of its own, crosses between a youthful Murray and Rublev. Looks aside, the youngster’s game also blends ingredients from those two players, plus Djokovic. There’s deep, crisp ball-striking (Rublev); shot preparation, backhand extension and recovery (Murray); and terrific balance (Djokovic)—sculpted by his upbringing as a promising skier. Sinner will need to strengthen his physique and endurance in his first full ATP season, but his innate talent and poise are primed to carry the ripe redhead to the Top 30.