Wimbledon champ Novak Djokovic and Australian Open champ Stan Wawrinka could meet in one semifinal on the men’s side. Second-seeded Roger Federer and fourth-seeded David Ferrer are in the other half.
French Open runner-up Simona Halep is seeded second after reaching a career-best ranking this month. She has never advanced past the fourth round at the U.S. Open.
Federer moved up one spot from his No. 3 ranking because 2013 champion Rafael Nadal withdrew from the year’s last Grand Slam tournament with an injured right wrist.
The other U.S. Open men’s singles champions who did not return to the field the following year were Ken Rosewall in 1971, Pete Sampras in 2003, and Juan Martin del Potro in 2010.
Serena Williams earned a 2-6, 6-2, 6-4 win over Caroline Wozniacki on Saturday to reach the final of the Western & Southern Open.
Venus Williams defeated Serena 6-7 (2), 6-2, 6-3 Saturday for the first win against her sister in more than five years and advanced to the final of the Rogers Cup.
On Sunday, Milos Raonic beat Vasek Pospisil in the first all-Canadian men’s final in ATP history. In doing so, Raonic capped off a nearly flawless week at the FitzGerald Tennis Center in Rock Creek Park.
Vasek Pospisil got the best of Tomas Berdych - again.
Many of the top seeds at the Citi Open view the hard court season as an opportunity to earn valuable rankings points and to potentially inch closer to the elusive top 5.
Top-seeded Lucie Safarova of the Czech Republic lost to France’s Kristina Mladenovic in the first round of the Citi Open on Tuesday.
Sixteen-year-old Francis Tiafoe lost his ATP tour debut while fellow Americans Robby Ginepri and Donald Young won their opening-round matches at the Citi Open on Monday.
Francis Tiafoe, 16 years old, will make his ATP main draw debut Monday at D.C.’s Citi Open from the William H.G. FitzGerald Tennis Center in Rock Creek Park, seven miles from his home in Riverdale Park, Maryland.