Serena Williams confirmed her attendance at the US Open but other senior tennis players such as Simona Halep have expressed doubts over travelling to the tournament.
Romanian tennis star Simona Halep has said she will not represent her country in the Fed Cup this year in order to concentrate on the Tokyo 2020 Olympics.
Karolina Pliskova got off the mark at the Women's Tennis Association (WTA) Finals in Shenzhen, China, and only had to play one set.
Elina Svitolina won a marathon tie-break on her way to beginning the defence of her title with victory over Karolína Plíšková at the Women's Tennis Association Finals in Shenzhen.
World number 116 Taylor Townsend of the United States stunned fourth seed and Wimbledon champion Simona Halep to reach the third round of the US Open.
Andrey Rublev caused the day's biggest shock at the Cincinnati Masters by knocking out third seed and seven-time tournament winner Roger Federer to reach the quarter-finals.
Simona Halep wrecked Serena Williams’ hopes of equalling the all-time record of 24 Grand Slam singles titles with a sensational display in the final of the women's singles at Wimbledon.
Romania's Simona Halep cruised into her first Wimbledon final with a straight-sets win over Ukraine's Elina Svitolina.