Simona Halep has become world number one for the first time by beating Jelena Ostapenko to reach the final of the China Open.
Romanian Halep won 6-2 6-4 in Beijing and will replace Spain's Garbine Muguruza at the top of the rankings.
Having suffered a shock defeat by Ostapenko in this year's French Open final, Halep was always in control against the world number eight.
She will face Caroline Garcia or Petra Kvitova in Sunday's final.
Halep, 26, will be confirmed in the number one spot when the rankings are released on Monday.