Osaka remained composed throughout Williams' repeated on-court protests at umpire Carlos Ramos, as she ended the 36-year-old's bid for a record-equalling 24th Grand Slam title.
"When you are little, you are taught not to look when the opponent gets angry, you are told to turnaround and try and focus," said Osaka. "In my mind I really wanted to know what was going on. I heard a lot of people in the crowd making noises and I really wanted to turn around."
Osaka became overwhelmed by emotion during the trophy presentation as boos - seemingly aimed at the umpire's decision to penalise Williams - rang around the court.