World number one Iga Swiatek has criticised the upcoming scheduling of tennis events, saying she will not be able to compete at next month's Billie Jean King Cup Finals.
However, the WTA Finals in Texas are due to end the day before.
The three-time Grand Slam champion said the schedule "is not safe", adding she felt "sad" to miss an event.
"I was thinking it through a lot and discussing it with my team, but I will not be able to play at the Billie Jean King Cup in Glasgow," Swiatek announced in a post on Instagram.