Three to See, US Open: Coco Gauff highlights a youth-laden Day 2

Before each day's play at the 2019 US Open, we'll preview three must-see matches.

Armstrong Stadium will start with a bang on Tuesday—a lot of them, most likely, as Tsitsipas and Rublev fire their heavy artillery at each other in what should be an arduous and tempestuous matchup of ATP young guns. The Greek and the Russian have split two unofficial matches: Rublev won in a third-set tiebreaker at a Challenger event in 2017, and Tsitsipas returned the favor in five shortened sets at the Next Gen Finals last fall. Ranking-wise, Tsitsipas at No. 8 has the obvious edge over Rublev at No. 47. But Rublev is coming off the biggest win of his career, over Roger Federer in Cincinnati, while Tsitsipas, who has hardly taken a week off all year, is coming off opening-round losses in Montreal and Cincinnati, as well as at Wimbledon. Does this one “have five sets written all over it”? Winner: Rublev

Most first-round matches between up-and-comers are highly anticipated; this one feels highly-dreaded. Auger-Aliassime and Shapovalov are countrymen, Davis Cup teammates, doubles partners, and longtime friends, and they also drew each other in the first round last year. Shapovalov won that one, when Auger-Aliassime was forced to retire due to a heart condition. But FAA avenged that defeat this spring on clay in Madrid. While it may be unfortunate, this match should also be an interesting one, and may even tell us something about the two players’ respective futures. Auger-Aliassime has had the better season and is ranked nearly 20 spots higher; but this past week in Winston-Salem, Shapovalov began working with Mikhail Youzhny, and he looked more energized and decisive than he has all year. Winner: Shapovalov

New girl on the block meets even newer girl on the block. The 18-year-old Potapova is a former junior world No. 1 who has begun to see some success at the WTA level this year. She upset Angelique Kerber at Roland Garros and reached the semis at the Baltic Open over the summer. Gauff, of course, is the 15-year-old American phenom who lit up Wimbledon with her fourth-round run. Gauff is already a star, and has the makings of a great player, but Potapova is probably a step or two ahead in her development. We’ll see if the crowd in Armstrong Stadium can help make up the difference. Winner: Potapova

Wake up every morning with Tennis Channel Live at the US Open, starting at 8 a.m. ET. For three hours leading up to the start of play, Tennis Channel's team will break down upcoming matches, review tournament storylines and focus on everything Flushing Meadows.

Tennis Channel's encore, all-night match coverage will begin every evening at 11 p.m. ET, with the exception of earlier starts on Saturday and Sunday of championship weekend.