By Shrivathsa Sridhar MELBOURNE (Reuters) -Defending champion Aryna Sabalenka will battle American 19th seed Madison Keys in the final on Saturday looking to become the first woman since Martina Hingis from 1997-99 to win the Australian Open title three times in a row.

The Madison Keys who will play two-time defending champion Aryna Sabalenka for the title at the Australian Open on Saturday night is not the same Madison Keys who was the runner-up at the U.S.

Yes, Aryna Sabalenka is the heavy favorite to win her third straight Australian Open title, but Madison Keys is playing lights-out tennis. Here's why she can pull off the upset.