The World number one beat Croatian Donna Vekic 6-3 4-6 7-6 (7-4) at the Porsche Tennis Grand Prix.
Osaka will now face Anett Kontaveit, who was able to progress after Victoria Azarenka retired.
Petra Kvitova will face Kiki Bertens in the other semi-final.
Isaac del Toro wins UAE Tour Stage 1
UAE Team Emirates-XRG rider Isaac Del Toro won the opening stage of the UAE Tour in Al Dhafra, leading the general classification after a wind-shortened day.
England survive Italy scare to reach World Cup Super 8 stage
An unbeaten fifty by Will Jacks and Sam Curran's three-wicket haul steered England to a nervy 24-run win over Italy in the Twenty20 World Cup on Monday, as the twice champions progressed to the Super Eight stage.
UAE suffer narrow T20 World Cup defeat to Afghanistan
The UAE suffered a narrow five-wicket defeat to Afghanistan in Group D on Monday to leave their hopes of reaching the Super Eight stage of the ICC Men's T20 World Cup hanging by a thread.
Australia batter Smith replaces Hazlewood in T20 World Cup squad
Batter Steve Smith has been added to Australia’s squad for the T20 World Cup, filling the final place in the team for injured paceman Josh Hazlewood, the team said on Monday.
Bejlek, Eala win Dubai main-draw debuts
Abu Dhabi champion Sara Bejlek and crowd favourite Alexandra Eala both scored wins in their respective tournament debuts at the Dubai Duty Free Tennis Championships on Sunday.
Dubai Police are warning the public about a rise in online begging during the holy month of Ramadan.
His Highness Sheikh Hamdan bin Mohammed bin Rashid Al Maktoum, Crown Prince of Dubai and the UAE's Deputy Prime Minister and Defence Minister, has offered his heartfelt condolences to the family of royal photographer Ramesh Shukla, who passed away on Sunday.
More than AED 76 million in debt have been settled for UAE nationals living in Sharjah.
