The fourth round of men's and women's singles play concluded on Monday night at the 2025 US Open. Now that we’re down to eight men and women in each singles draw, let’s take a look at the numbers that are currently moving the needle in Flushing Meadows.
1: Players aged 35 or older that reached the quarterfinals: Novak Djokovic (38).
2: Multiple-major winners that reached the quarterfinals in New York while ranked outside the WTA’s Top 50: No. 60-ranked Marketa Vondrousova and No. 62-ranked Barbora Krejcikova. It’s the first time that has happened since the WTA rankings were first published in 1975.
3: By defeating Jaume Munar on Monday, Lorenzo Musetti has become the third ATP player born in the 2000s to reach Slam quarterfinals on all three surfaces, along with Carlos Alcaraz and Jannik Sinner.
4: Sinner and Musetti’s safe passage into the quarterfinals means that 2025 is the first time in history multiple Italian men have reached the quarterfinals of all four Grand Slam events in a season (Australian Open: Sinner, Sonego; Roland-Garros: Musetti, Sinner; Wimbledon: Cobolli, Sinner).
Sinner and Musetti are slated to meet in the first all-Italian men’s singles Grand Slam quarterfinal in the Open Era in New York.
5: By winning his 25th consecutive match at hard court Grand Slams on Monday, Jannik Sinner is now fifth on the all-time list in that category, which is led by Roger Federer, who won 40 hard-court matches at the majors in succession from 2005 to 2008.
If Sinner successfully defends the title, he’d move into second on that list at 28.
6: Number of Grand Slam quarterfinals reached by Alex de Minaur. The Aussie, who has made three of them in New York, is 0-5 in his previous trips to that stage.
6: Number of former or current World No. 1s that reached the quarterfinals: Aryna Sabalenka, Jannik Sinner, Iga Swiatek, Novak Djokovic, Carlos Alcaraz, Naomi Osaka.
7: Moms that entered the 2025 US Open women’s singles draw—Elina Svitolina, Victoria Azarenka, Belinda Bencic, Tatjana Maria, Taylor Townsend, Petra Kvitova and Naomi Osaka.
Osaka, into the quarterfinals, is the last mom standing. A mom has reached at least the quarterfinals of all four majors in 2025.
8: Number of match points saved by Barbora Krejcikova during her thrilling fourth-round victory over Taylor Townsend on Sunday.
9: Years since an unseeded woman has notched multiple Top 10 wins to reach the US Open quarterfinals. Marketa Vondrousova changed that by defeating No. 8 Jasmine Paolini and No. 9 Elena Rybakina in back-to-back matches. The last player to do it was Caroline Wozniacki in 2016. She was ranked No.74 when she defeated No. 9-seeded Svetlana Kuznetsova and No. 8-seeded Madison Keys.
10: With eight consecutive Grand Slam quarterfinals reached, Jannik Sinner now holds the 10th-longest streak in that category. Roger Federer (36, from 2004 to 2013) is the all-time leader.
11: Defending champions Jannik Sinner and Aryna Sabalenka stretched their US Open winning streaks to 11 with their Round of 16 wins.
12: Sets played by Karolina Muchova. The Czech has had to go the distance in all four of her matches thus far in New York.
17: Number of games dropped by Jessica Pegula through four rounds, fewest of all singles players.
18: Aryna Sabalenka has won 18 consecutive tiebreaks after recording her last successful breaker during her third-round win over Leylah Fernandez, 6-3, 7-6(2), Friday.
19: Alex de Minaur is the first Aussie man to reach back-to-back US Open quarterfinals since Lleyton Hewitt in 2006.
20: By defeating Ekaterina Alexandrova on Day 9, Iga Swiatek became the youngest woman to reach all Grand Slams quarterfinals in a single season since 18-year-old Maria Sharapova, 20 years ago in 2005.
21: Two women—Aryna Sabalenka and Iga Swiatek with 21 each—have claimed over 20 wins in Grand Slam events in the same season for the first time since 2012, when Victoria Azarenka and Maria Sharapova managed 21 each.
28: Number of hard-court wins notched by Alex de Minaur thus far in 2025, leading all ATP players.
37-2: Sabalenka’s record at the hard-court majors since the start of 2022. Her lone defeats came to Coco Gauff in the 2023 US Open final and Madison Keys in this year’s Australian Open final.
62: The lowest-ranked player remaining in either singles draw: Barbora Krejcikova.
64: Number of major quarterfinals reached by Novak Djokovic, the all-time record.
68: Coleman Wong, who lost in the third round, still leads all players in total aces.
69-4: Sinner’s record on hard courts since the start of 2024. Three of those losses have come against his main rival Alcaraz.
71: Percent of return games won by Jessica Pegula through four rounds, which leads all singles players.
