NEW YORK -- For the past three days, New Yorkers enjoyed the three-day weekend, flocked to the Billie Jean King National Tennis Center and helped the US Open set attendance records.
Sadly, the party's over, but there are still some tantalizing quarterfinal matches to be seen Tuesday if you can manage it. Here's what you need to know on Day 9.
Watch every match
At noon ET, ESPN3 will begin full coverage of all matches around the grounds. Click to watch multicam.
At noon ET, ESPN2 and WatchESPN begin coverage of Tuesday's quarterfinal matches. Click to watch.
To view starting times of upcoming days at the US Open, click here.
Live scoring
Our real-time scoreboard, updated stats and social handles can be found on one spot, US Open CourtCast.
Schedules
Here's a schedule of who's playing Tuesday. Click here.
Tuesday's key matches
No. 2 Angelique Kerber versus No. 7 Roberta Vinci, noon ET on Arthur Ashe Stadium (Watch)
This is another confrontation involving two old foes, but there has never been so much at stake. Kerber, 28, is trying to lock down the No. 1 ranking currently held by Serena Williams. Vinci will try to replicate last year's stunning win over Williams here in the semifinals, the match of the 33-year-old Italian's life. They've split their previous four matches, but never met in a Grand Slam.
No. 10 Gael Monfils versus No. 24 Lucas Pouille, following Kerber-Vinci (Watch)
Vive la France! There will be at least one Frenchman in the semifinals after this one. Along with Tsonga, these two gave France its first trifecta in the quarters of a Grand Slam in 69 years. This could be a good one; the only time they've played was the 2015 Australian Open, and Monfils came back from a two-set deficit to win in five. Speaking of which, Pouille has gone the maximum five sets in his past three outings here, while Monfils has played the minimum 12 sets through four rounds. Even though Pouille, at 22, is eight years younger, fatigue could be a factor.
Caroline Wozniacki versus Anastasija Sevastova, 7 p.m. ET on Arthur Ashe Stadium (Watch)
This is the only all-unseeded quarter in either draw. Wozniacki, the former world No. 1, has suffered a string of injuries and fallen all the way to No. 74. Sevastova, ranked No. 48, was out of tennis for nearly two years from 2013-14. They've played only once, more than five years ago, when Wozniacki won in Melbourne in straight sets.
No. 1 Novak Djokovic versus No. Jo-Wilfried Tsonga, following Wozniacki-Sevastova (Watch)
These two veterans are meeting for the 22nd time. Djokovic leads the head-to-head 15-6, and he has won five of the six encounters in Grand Slams, including the past four. The only time they played previously in 2016, Djokovic won a match by the thinnest of margins, 7-6 (2), 7-6 (2), in the quarterfinals at Indian Wells.