NEW YORK -- Seventeen American women and eleven American men began the tournament on Monday, and through the first round it's the women who have outshone the men at the U.S. Open. Led by No. 1 Serena Williams, 12 American women are into the second round, with an 11-0 record against unseeded players and 15-year-old CiCi Bellis beating 12th seed Dominika Cibulkova. Three American men are through to the second round with two to play -- Steve Johnson and Ryan Harrison -- with six bowing out in the first round.
Here's a summary of how the Americans have fared so far:
No. 1 Serena Williams: She looked sharp in her first round match, beating 18-year-old Taylor Townsend 6-3, 6-1. She plays another American, Vania King, in the second round. The last time Serena failed to make the quarterfinals or better in New York was 2006, when she lost in the fourth round.
No. 20 Venus Williams: After a great summer in which she made the quarterfinals at the Bank of the West Classic and the finals of Rogers Cup, Venus got through a tricky match to beat 43-year-old Kimiko Date-Krumm 2-6, 6-3, 6-3. She plays Switzerland's Timea Bacsinszky on Wednesday night.
No. 28 Madison Keys: She didn't have a great summer hard court season but the week she spent back in Boca Raton training before the tournament looks to have helped her game. She beat Australian wildcard Jarmila Gajdosova 6-3, 6-0 and plays qualifier Aleksandra Krunic in Round 2. A win would move her past Stephens as the No. 3 American, and she could play Wimbledon champion Petra Kvitova in the third round.
No. 39 CoCo Vandeweghe: The 22-year-old said she didn't have a great week of prep after getting routed by Camila Giorgi in the first round of the Connecticut Open. She was whiny and frustrated after her Rogers Cup success -- she beat Ana Ivanovic and Jelena Jankovic -- because it changed her own expectations of herself. That frustration continued on Tuesday and a perfectly good racket paid the price, but she came back to beat Donna Vekic, 3-6, 6-2, 6-1. She plays 15th-seed Carla Suarez Navarro in Round 2.
No. 43 Christina McHale: Beat Chanelle Scheepers, 6-2, 1-6, 7-6 (5). Plays 16th seed Victoria Azarenka.
No. 52 Varvara Lepchenko: Beat Alison Van Uytvanck 7-5, 6-2. Plays Mona Barthel in Round 2.
No. 80 Vania King: Beat Francesa Schiavone 6-3, 3-6, 6-3. Plays Serena in Round 2. Nothing like looking at your draw and seeing you get two Slam champions in your first two rounds.
No. 86 Shelby Rogers: Beat qualifier Maryna Zanevska 6-4, 6-3. Plays 11th seed Flavia Pennetta in Round 2. Upset alert? Rogers has been playing very well the last two months, making the final in Bad Gastein and beating Eugenie Bouchard in Montreal.
No. 123 Madison Brengle: Beat Julia Glushko 6-3, 6-2 for her first win at a major. Plays Sabine Lisicki in the second round.
No. 136 Nicole Gibbs: The 2012 NCAA champion from Stanford beat Caroline Garcia 6-2, 2-6, 6-3 for her first win at a Slam. Plays 23rd-seed Anastasia Pavlyuchenkova.
No. 1211 CiCi Bellis: Beat 12th-seed Dominika Cibulkova 6-1, 4-6, 6-4 to win her first WTA level match in her WTA and Grand Slam debut. Bellis earned her wildcard after winning the Girls 18s National Championships and played with remarkable poise.
No. 22 Sloane Stephens: She looked to have found her game and intensity in a 6-0, 6-3 win over Annika Beck in the first round but lost in the second round to No. 96 Johanna Larsson. After making the fourth round or better at six consecutive Slams, Stephens has now failed to get past the second round in the last two.
No. 44 Alison Riske: Lost to 8th seed Ana Ivanovic 6-3, 6-0.
No. 48 Lauren Davis: Lost to 24th seed Sam Stosur 6-1, 6-4.
No. 103 Taylor Townsend: Lost to Serena Williams 6-3, 6-1 but is still in doubles and mixed doubles.
No. 105 Grace Min: Lost to 17th seed Ekaterina Makarova 6-4, 6-2.
Danielle Rose Collins: Lost to No. 2 Simona Halep 6-7 (2), 6-1, 6-2.
No. 15 John Isner: Beat American wildcard Marcos Giron 7-6 (5), 6-2, 7-6 (2). The good news is he showed no signs of the ankle injury that forced him out of the Winston-Salem Open last week. Plays Jan-Lennard Struff in round two.
No. 57 Sam Querrey: He definitely took the long road, but this beating Maximo Gonzalez 6-2, 4-6, 6-4, 4-6, 6-3 showed some good endurance and focus. Plays 28th seed Guillermo Garcia-Lopez in round two. The winner plays top seed Novak Djokovic.
No. 90 Tim Smyczek: The man from Wisconsin was the last American man standing last year so he has a good number of points to defend here (he made the third round). He beat Serbian qualifier Filip Krajinovic 4-6, 6-3, 6-2, 7-6 (5), and plays 17th-seed Roberto Bautista Agut next.
No. 51 Steve Johnson: Plays Japanese qualifier Tatsuma Ito on Wednesday.
No. 184 Ryan Harrison: Plays seventh seed Grigor Dimitrov on Wednesday.
No. 47 Donald Young: Lost to Blaz Kavcic 7-5, 6-4, 6-4.
No. 55 Jack Sock: Retired down 6-4, 3-6, 6-1 with a calf injury to Pablo Andujar.
No. 117 Bradley Klahn: Lost to Andrey Kuznetsov 6-4, 4-6, 6-3, 7-5.
No. 176 Wayne Odesnik: Lost to 10th seed Kei Nishikori 6-2, 6-4, 6-2.
No. 585 Noah Rubin: Lost to Federico Delbonis 6-4, 6-3, 6-0.
No. 303 Jared Donaldson: Lost to 20th seed Gael Monfils 6-4, 6-2, 6-4.