NEW YORK – A marathon, 87-match singles spree caught up on Tuesday’s rainout, so the US Open is back to normal. At least for a few days.
And on Day 4, it’s Rafa and Roger time, as both play their second-round matches.
Whether they’ll rotate day and night session on Arthur Ashe for as long as both are in the tournament is too soon to predict.
But Federer has the late-afternoon slot against Russian veteran Mikhail Youzhny. And Nadal has the late-night session against New York-born Japanese player Taro Daniel.
Neither figures to struggle. But you never know.
The men’s and women’s doubles, as well as the mixed doubles, also get under way today. The doubles might have begun Wednesday but for the catchup on the singles side. So the schedule is full.
Some of the players who playd their first rounds Wednesday will have to play again today. On the men’s side, with the best-of-five, that’s more of a factor.
Among those players are Juan Martin del Potro, David Goffin, Grigor Dimitrov and Gaël Monfils.
Women’s Matches to Watch
 Jelena Ostapenko (LAT) vs. Sorana Cirstea (ROU)
Ostapenko has generally been fairly quiet out there since her surprise win at the French Open. Although she did have a decent run at Wimbledon. But her North American summer hasn’t amounted to much.
Cirstea should not be an unsurmountable obstacle. But you never know. On the plus side, upsets have meant that there isn’t a single seeded player potentially in Ostapenko’s way until the quarterfinals. So watch out.
Cirstea crushed qualifier Lesley Kerkhove in the first round, despite a rather comprehensive (and unusual) tape job on her right arm in practice leading up to it.
Yanina Wickmayer (BEL) vs. [Q] Kaia Kanepi (EST)
This is a matchup between two former top-15 players, who have fallen on more difficult times.
The 27-year-old Wickmayer, currently at No. 129, was No. 12 in the world when she was 20. Kanepi, who has struggled with Guillain-Barré syndrome and mononucleosis the last few years, was ranked No. 15 just five years ago, after a (relatively) late surge up the rankings.
She’s currently at No. 419. And she had to use a protected ranking just to get into the qualifying.
It’s a great opportunity for both.
Daria Kasatkina (RUS) vs. Christina Mchale (USA)
Kasatkina, still 19, had a great run this past April in winning the Har-Tru event in Charleston. But since then, she has struggled, no doubt in part because of an ankle injury. She lost first round in Stuttgart, Madrid and Rome (there can always be a hangover exhaustion effect after a young player does such a big thing, and hers lasted the clay-court tuneup season).
She didn’t play between the French Open and Wimbledon, and hasn’t won back-to-back matches since.
As for McHale, she’s 25 now. And it’s been five years since she broke into the top 25 right around this time. She’s ranked No. 63 and it might be time for a good result, so close to where she grew up.
Men’s Matches to Watch
 Dominic Thiem (AUT) vs. [WC] Taylor Fritz (USA)
The new father has his entire extended family with him in New York, and the group effort was effective in a comprehensive first-round win over veteran Marcos Baghdatis.
Thiem is a different customer. And though he’s not renowned for his hard-court efforts, he had no trouble at all in dismissing another wid card, Aussie Alex de Minaur, over two days to reach the second round.
 Feliciano Lopez (ESP) vs. Fernando Verdasco (ESP)
Former doubles partners, friends and longtime foes, the two veteran Spaniards meet again on, as it happens, Court 13.
Both lefties, they go at it in completely different ways as Verdasco is a fairly stubborn baseliner, while Lopez is much more of an all-court attacker in a very non-Spanish way.
Surprisingly, they’ve only played eight times – and never at a Grand Slam. And only once since 2013. There’s no pattern from their meetings as both have beaten each other on the various surfaces.
Superficially, this is also a highly attractive matchup. But you didn’t read that here.
 Grigor Dimitrov (BUL) vs. Andrey Rublev (RUS)
Rublev is one of the less-heralded young guns. But he’s on his way just the same.
He’s left to carry the torch for the 4 Slam tennis academy as his countryman and training partner Karen Khachanov was upset in the first round. And he’ll bring plenty of fire to this match against Dimitrov.
If Dimitrov were in the bottom half of the draw and not the top, you’d give him a ghost of a chance on a deep run in this tournament. As it is, most likely will make his seeding and get to the quarterfinals. But he has to get through Rublev first. And that’s easier said than done.