Venus Williams sets high on No . 1 ranking for the first time in four years . Williams beat Sara Errani to reach the Rome Masters final . Younger sister Serena also into the last eight after beating Urszula Radwanska . Defending U.S. Open champion Sam Stosur and Czech Petra Vera also advance .
Venus Williams sets sights on No . 1 ranking for the first time in 10 years . Williams beat Sara Errani to reach the Cincinnati Masters quarterfinals . Younger sister Serena also into the last eight after beating Urszula Radwanska . Defending U.S. Open champion Sam Stosur and Czech Petra Kvitova also advance .