(REUTERS) - Spanish women's tennis world No. 4 Garbine Muguruza has withdrawn from this week's Hong Kong Open owing to a lingering ankle injury, organisers said on Monday.

Muguruza, who turned 22 last week, claimed the biggest title of her fledgling career by beating Switzerland's Timea Bacsinszky 7-5, 6-4 on Sunday to win the China Open, rising to fourth in the rankings, a point behind third-placed Russian Maria Sharapova.

"Muguruza suffered a left ankle injury while playing in the Wuhan Open at the beginning of October," the Hong Kong organisers said on the tournament website (www.hktennisopen.hk).

"The Spaniard ... will now rest the injury ahead of a likely appearance at the season-ending WTA Finals beginning on Oct 25," they added.

Muguruza's run to the final in Wuhan, where she lost to Venus Williams, and her success in Beijing meant she reached finals in back-to-back weeks for the first time.

Her withdrawal in Hong Kong follows those of Belarusian Victoria Azarenka, Eugenie Bouchard of Canada and Germany's Sabine Lisicki, who are also injured.