The number two seed will face Spain's David Ferrer looking to secure a title for the third Sunday in a row.
Murray, enjoying a superb run in Asia, will be out to add to his titles from Bangkok and Tokyo tomorrow after a 6-3 6-0 demolition of unseeded Nishikori.
The Scot was taking on a player currently being tutored by his former coach, Brad Gilbert, but Murray and Nishikori were incomparable today.
They shared the opening six games, but thereafter Murray was merciless as he closed in on a fifth title in 2011. Nishikori did not win another game.
Once he got ahead, Murray made sure it stayed that way. He broke Nishikori's serve to love in the ninth game to capture the opening set, forcing successive forehand errors from his opponent.
Murray had won every point when his first serve went in during the opening set, and that theme barely changed in the next.
Dressed in all black, Murray broke in the second game of the second set with a flowing forehand pass down the line.
He was then taken all the way to deuce by Nishikori, but a drop shot won Murray the game.
Nishikori continued to dish up break points and Murray fed on the openings.
A drilled backhand down the line took Murray 4-0 ahead and there was no way back for the 21-year-old from Shimane, who was facing the world number four for the first time.
Murray holds a 4-3 lead in his head-to-head rivalry with world number five Ferrer.
It is a record Murray has substantially improved by winning their last three contests, including their semi-final in Tokyo last week where Ferrer picked up only five games.
Ferrer, who is the third seed this week, beat his fellow Spaniard Feliciano Lopez in three sets earlier today to reach the final.
He dropped the opener but came back strongly against unseeded Lopez to go through 6-7 (5/7) 6-3 6-3.