Keyes defeated number two seed Iga Swiatek in a tie-break in the third set
Madison Keys will face Aryna Sabalenka in a Grand Slam final for the first time this weekend.
The American defeated number two seed Iga Swiatek in a tie-break in the third set.
Sabalenka can become the first woman to win three consecutive Australian Open titles since Martina Hingis in 1999.
The final takes place in Melbourne this Saturday.

Head Coach Andy Farrell Names His Team for Ireland's Game Against New Zealand
Thursday Morning Sports Update
Littler Misses Today's Players Championship 33 Event Due To Traffic
Rory Best Set To Return To Ulster As The Province's New General Manager
Wednesday Morning Sports Update
Claims Ladies Senior Camogie Final Celebrated In Dark Refuted By Kildare LGFA And Kildare GAA
Kildare's Lauren Walsh Finished Third At The Wistron Ladies Open
Tuesday Morning Sports Update