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.
British number one Heather Watson suffered a first-round exit at the Citi Open in Washington DC on Tuesday.
Kevin Anderson became the first man through to the third round of the Citi Open on Tuesday.
Sixth seed Robin Haase suffered a shock first-round defeat to Paolo Lorenzi at the bet-at-home Cup in Kitzbuhel.
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Sky Bet are celebrating the return of the football season with their new loyalty scheme - the Sky Bet Club.
Wimbledon semi-finalist Grigor Dimitrov pulled out of the Citi Open on the opening day due to illness.
Karolina Pliskova will next face Serena Williams by beating Kimiko Date-Krumm at the Bank of the West Classic.