She survived a ferocious fightback from China's Li Na on Thursday to book her place in the Sydney International final against in-form Serb Jelena Jankovic.
Jankovic will face Vera Zvonareva in Saturday's final after the Russian overcame American Jill Craybas.
World number one Naomi Osaka was beaten in her opening match at the Dubai Duty Free Tennis Championships on Tuesday, losing to France's Kristina Mladenovic 6-3, 6-3 on her return to competitive action after winning last month's Australian Open.
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The former world No 4 denied recent suggestions from her father that she had been kidnapped.
Jelena Jankovic beat Spain's Virginia Ruano Pascual 6-0 6-0 to reach the quarter-finals of the China Open.
Top seed Maria Sharapova was stretched by Serbia's Ana Ivanovic before she claimed a 7-6 7-5 win to reach the semi-finals of the Linz Open on Friday.
Wimbledon champion Venus Williams was pushed to the limit before beating third seed Jelena Jankovic of Serbia 4-6 6-1 7-6 on Wednesday to reach the US Open semi-finals.
Top seed Maria Sharapova won her seventh straight match on US soil by defeating holder Elena Dementieva 6-3 6-4 in the quarter-finals of the Los Angeles Classic on Friday.
Serbia's Jelena Jankovic thrashed Lourdes Dominguez Lino of Spain 6-0 6-1 in the first round of the China Open on Monday, her first outing since her U.S. Open heroics two weeks ago.
That was the only match completed before rain wiped out the rest of Tuesday's action at the US Open.
Sixth seeded Svetlana Kuznetsova was beaten by Serbian 19th seed Jelena Jankovic in the fourth round of the US Open.
A fatigued Sharapova lost to fellow-Russian Elena Dementieva while Williams was beaten Serbian Jelena Jankovic in the semi-finals of the Los Angeles Open.
Third seed Jelena Jankovic had to work very hard on Friday to quell the challenge of Czech Lucie Safarova 5-7 7-6 6-2 and reach the fourth round at Wimbledon.
A resurgent Serena Williams overcame a strong challenge from fellow-American Meghann Shaughnessy, winning 6-7, 6-1, 6-4.
The duo lost to wild card entrants Ana Ivanovic and Maria Kirilenko 7-6(2), 6-2 in the first round of the Los Angeles Open.
Top seed Kim Clijsters edged past Jelena Jankovic, while Maria Sharapova beat fellow Russian Vera Zvonareva at the Acura Classic.
Serena Williams reluctantly pulled out of this year's Australian Open on Friday, the American saying that while she was close to regaining full fitness after giving birth to her first child in September, she was not fully ready to defend her title.
The Serbian has found little time to study now that she has reached number three in the world and has her sights set on Wimbledon.
Dinara Safina and Maria Kirilenko were upset in the first round of San Diego Classic.
The Belgian battled past Jelena Jankovic 5-7, 6-2, 6-2 in the second round of the Bank of the West Classic
Russia's Vera Zvonareva rounded off a week of upsets with a 6-2, 6-4 victory over Katarina Srebotnik of Slovenia to win the Cincinnati Open on Sunday.
The Indian ace was beaten by the top seeded Swiss girl 6-7(7), 5-7 in the quarter-finals.
'I will put everything I have Saturday on the court'
She will face the Serbian in the first round of Cincinnati Open in Ohio on Monday.
Former men's champion Mats Wilander believes third seed Muguruza now looks like the most likely champion, having not dropped a set and thrashing Maria Sharapova on Wednesday.
Defending champion Nadia Petrova was also shown the door in the quarter-finals of the German Open.
Sania Mirza and Alicia Molik drubbed Jelena Kostanic and Angelique Widjaja 6-3, 6-3 in Istanbul
'Maria will look at it and see no one dominant. Serena Williams is the only player in the past who has been like a thorn in her side, but she feels mentally superior to most of the other and she feels she can win against them all'
Maria Sharapova was dogged by injury and controversy as she tried to get her career back on track.
Since reaching the Australian Open semi-finals in 2011, Wozniacki had fallen one round earlier in each subsequent visit to Melbourne Park - which meant her journey to this season's opening Grand Slam was full of trepidation.
Kim Clijsters beat Nadia Petrova 7-5, 6-7, 6-1 to set up a quarter-final clash with Venus Williams at the Antwerp Diamond Games.
The former world number one celebrated her long-awaited return from a serious wrist injury with a demolition job against Croatia's Jelena Kostanic in the Antwerp Open.
The Italian staged a remarkable recovery to beat Jelena Kostanic of Croatia and capture her maiden WTA singles title.
Indian tennis ace Sania Mirza and her Swiss partner Martina Hingis extended their winning streak to 37 games with a straight sets victory in the opening round of the women's doubles event at the St Petersburg Ladies Trophy on Thursday.
Joining her in the last four stage are France's Camille Pin, American Jill Craybas and Russia's Vera Zvonareva.
Maria Sharapova-led Russian brigade captured four of the round of 16 berths at the Australian Open on Friday
Jelena Dokic went down to Virginie Razzano, while Elena Dementieva was beaten by Germany's Julia Schruff at the Australian Open.
Serena Williams rallied to avoid a stunning upset and secure a 1-6, 6-3, 6-3 semi-final win over Czech qualifier Marie Bouzkova at the Rogers Cup on Saturday, setting up a title showdown with local teenager Bianca Andreescu.