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.
Antonelli takes third win a row for Mercedes to stretch F1 lead in Miami
Italian teenager Kimi Antonelli won the Miami Grand Prix for Mercedes on Sunday and stretched his Formula One championship lead to 20 points with an impressive third victory in a row.
Tadej Pogačar secures UAE Team Emirates XRG Tour de Romandie title
Tadej Pogačar of UAE Team Emirates XRG claimed the 2026 Tour de Romandie title after winning the fifth and final stage on Sunday in Switzerland, securing the overall classification in his debut appearance at the race.
Mainoo lifts Manchester United to 3-2 win over rivals Liverpool
Manchester United's Kobbie Mainoo struck late to seal a dramatic 3-2 Premier League victory over rivals Liverpool on Sunday as the home side secured their return to the Champions League next season after a two-year absence.
Sinner storms past Zverev to claim Madrid crown
World number one Jannik Sinner became the first man to win five successive Masters 1000 titles after he produced a breathtaking display to crush Alexander Zverev 6-1 6-2 in just 57 minutes in the Madrid Open final on Sunday.
Former United manager Ferguson taken to hospital after health scare at Old Trafford
Former Manchester United manager Alex Ferguson has been taken to hospital after feeling unwell ahead of Sunday's Premier League match between United and Liverpool, media reported. box
