Top seed Tomas Berdych was stunned by world number 36 Vasek Pospisil at the Citi Open in Washington.
Radek Stepanek Outrights
Serena Williams Outrights
- View all oddsTo Win 23 Grand Slam Singles Titles In This Tournament
Doesnt happen before the end of 2016 (1/41), US Open (8), Wimbledon (11), French Open (2…
- View all oddsTo Win 23 Grand Slam Singles Titles On This Year
Doesnt happen before the end of 2016 (1/41), 2016 (14)
- View all oddsTo Win 23 Grand Slams By End Of 2016
No (1/41), Yes (14)
Angelique Kerber survived a major scare to progress through to the quarter-finals of the Bank of the West Classic
Third seed Lukas Rosol suffered a quarter-final defeat to qualifier Maximo Gonzalez at the bet-at-home Cup Kitzbuhel.
Two-time Grand Slam champion Li Na is out of next month's US Open because of a knee injury.
Tomas Berdych lived up to his billing in the second round of the Citi Open in Washington with a win over Robby Ginepri.
Serena Williams made a winning return to action by beating Karolina Pliskova at the Bank of the West Classic.
Marina Erakovic safely made it through to the third round of the Citi Open with a comfortable win over Shelby Rogers.
Rafael Nadal's US Open participation is in doubt after pulling out of the next two ATP Masters events due to injury.
Lukas Rosol safely made it through to the quarter-finals of the bet-at-home Cup Kitzbuhel on Wednesday.
Sabine Lisicki recorded the fastest ever serve in WTA history during her first-round match in Stanford.