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.
Sinner cruises past Fils to reach Madrid Open final
World number one Jannik Sinner powered into the Madrid Open final with a 6-2 6-4 victory over Arthur Fils on Friday, keeping alive his bid for a record fifth successive ATP Masters 1000 title.
Blockx converts late Madrid call-up into breakthrough semi-final run
Alexander Blockx arrived at the Madrid Open expecting to play the qualifying rounds, but the Belgian has made the most of his late promotion to the main draw after a string of withdrawals, riding a wave of confidence to the semi-finals.
Holder brings 'sprinkling of stardust' as Gujarat beat RCB
Jason Holder's display in Gujarat Titans' four-wicket IPL win over champions Royal Challengers Bengaluru was exactly what the team was looking for when they bought the West Indies international, director of cricket Vikram Solanki said.
Japanese trailblazer Nishikori to retire at end of season
Kei Nishikori will hang up his racquet at the end of the 2026 season, the 36-year-old said on Friday, bringing down the curtain on a professional career that saw him break new ground for Japanese tennis.
Wood penalty hands Forest win over Villa in Europa League semi first leg
Nottingham Forest's Chris Wood smashed a penalty into the top corner to secure a 1-0 victory over Aston Villa in the first leg of their all-English Europa League semi-final on Thursday.
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