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.
Morocco to appeal CAF rulings on disorderly AFCON final
Morocco's football federation (FRMF) announced on Tuesday it would appeal the Confederation of African Football's (CAF) disciplinary rulings over last month's chaotic Africa Cup of Nations final against Senegal, which the hosts lost 1-0 after extra time.
Dupont back for France in Six Nations opener against Ireland
Captain Antoine Dupont will make his return to the France team for their Six Nations opener against Ireland on Thursday, 11 months after suffering a serious knee injury, coach Fabien Galthie said on Tuesday.
Benzema moves to Al-Hilal following Al-Ittihad departure
Karim Benzema has joined Al-Hilal, the Saudi Pro League leaders announced on Monday, following the termination of his contract with Al-Ittihad.
Pakistan to boycott T20 World Cup group match against India
Pakistan will boycott their February 15 match of the Twenty20 World Cup against arch-rivals India in Colombo, the Pakistan government said on Sunday while approving the team's participation in the global showpiece.
Dubai Basketball rounds off Family Day with another ABA League win
Dubai Basketball has marked its growing popularity in the UAE by hosting its first Family Day on Sunday, and marked celebrations with another ABA League victory against Bosnian side Igokea at Coca-Cola Arena.
