Kyrgios, who beat Rafael Nadal in the quarter-finals, moved a step closer to claiming his first title of the year as he overcame Spaniard David Ferrer 7-6, 7-6 at the Lindner Family Tennis Center in Ohio.

The Australian, known for his fiery behaviour on the court, will be bidding to earn his fifth title of the year.

Kyrgios admitted he found facing Ferrer tricky in his semi-final and hopes he can replicate the character he showed in edging past the Spaniard.

"He was a nightmare to play, especially because I'm a tall guy and he's not the tallest guy," he said.

"In the tie-breaks I served well, but I definitely didn't bring my best tennis.

"I'm just really proud that I managed to scrap out the win."

World number 11 Dimitrov outfought big-serving American John Isner 7-6, 7-6 to secure his place in the final.

Dimitrov, who reached the semi-finals of this year's Australian Open, will be competing in his first Masters 1000 final when he takes on Kyrgios tomorrow.

Romanian Simona Halep and Wimbledon champion Garbiñe Muguruza of Spain will battle it out for the women's crown.

Halep, who will become world number one if she wins the tournament, swept aside American Sloane Stephens 6-2, 6-1.

Muguruza was also in commanding form as she ousted the Czech Republic's Karolína Plíšková, who currently holds the women's number one ranking, 6-3, 6-2.

"I think it's something special to get number one in the world," said Halep.

"Everyone can get to number one now. 

"The ranking is close. 

"I really want that."