Last year US open champion Osaka is now on course to make it back to back Grand Slam titles as she wraps up a hugely impressive 6-3 6-4 win over Serena to make it 20 wins in a row.
It is a setback for Williams as she once again came up short in her 10th attempt to level with Margaret Court’s haul of major titles.
Osaka to play Jennifer Brady for the title on Saturday as Williams breaks down in tears during a press conference, Sky sports reports.
While Jennifer Brady defeated Karolina Muchova to reach her first major final, Osaka reached her fourth major title final and stretched her winning streak to 20 matches