It was Sabalenka's second title this year after a win at the Qatar Open in February, before the coronavirus pandemic broke out.
The 22-year-old Sabalenka started on a high and earned two break points in the first game, but Azarenka survived the scare and they both held on to their serve until 2-2.
Playing her 40th WTA final, Azarenka won the first game of the second set before losing the next two as she visibly started struggling with an apparent health problem, finding it hard to move.
"So I just tried to stay focused, make sure I hit clean shots."
"There were winners from her shots, she closed her eyes and hit every point and I couldn't do anything," Sabalenka said.