Novak Djokovic and Simona Halep were among players to win two matches on the same day to book their places in the semi-finals of the Cincinnati Masters.
Members of the International Tennis Federation (ITF) have given the green light to controversial reforms to the Davis Cup which will see the competition transformed into a season-ending 18-team event.
World number one Simona Halep completed victory in her delayed match at the Cincinnati Masters to book her place in the third round on a rain affected day.
Defending women's champion Garbiñe Muguruza crashed out following a shock defeat to Ukraine's Lesia Tsurenko as Australian Nick Kyrgios was again involved in controversy in his second round victory at the Cincinnati Masters.
Controversial reforms to the Davis Cup will be voted on at a key International Tennis Federation (ITF) meeting in Orlando tomorrow as President David Haggerty continued to lead calls for the sweeping changes to be passed.
Petra Kvitová of the Czech Republic battled to a three-set victory over Serena Williams to book her place in the third round of the Cincinnati Masters.
Wimbledon champion Novak Djokovic and Serena Williams of the United States booked their places in the second round of the men's and women's singles events respectively on the opening day of the Cincinnati Masters.
World number one Rafael Nadal overcame birthday boy Stefanos Tsitsipas of Greece to claim victory at the Rogers Cup in Toronto.
Brazil denied Italy a second successive Beach Tennis World Team Championships title in Moscow today with victory in the final.
Stefanos Tsitsipas of Greece continued his sensational run at the Rogers Cup by beating Wimbledon finalist Kevin Anderson to set up a final with Rafael Nadal in Toronto
Stefanos Tsitsipas of Greece continued his stunning run at the Rogers Cup as he dethroned defending champion Alexander Zverev to reach the semi-finals in Toronto.
Germany and San Marino both won their matches today to set up a fifth-place play-off encounter at the Beach Tennis World Team Championship in Moscow.
Former doubles world number one Peng Shuai has been given a suspended six-month ban after she was found to have used "coercion and offered the possibility of financial reward" in return for her partner withdrawing from last year's Wimbledon Championships.
Stefanos Tsitsipas of Greece stunned Novak Djokovic with a three-set victory to end the Wimbledon champion's pursuit of a fifth Rogers Cup crown in Toronto.
Defending champions Italy were among teams to reach the semi-finals of the Beach Tennis World Team Championships in Moscow today.