British number one Johanna Konta has pulled out of next week's Hong Kong Open with a foot injury, but hopes to return in Moscow the following week.
Konta, 26, currently holds the eighth and final qualifying position for this month's season-ending WTA Finals.
Losing to Monica Niculescu in this week's China Open took her losing streak to five matches and opened the door for other players to overtake her.
Her Finals place could be confirmed depending on results at the China Open.
She was beaten by Romania's world number 65 Niculescu in her opening match in Beijing on Sunday, continuing a winless run that will now extend to at least eight weeks.