Roger Federer claimed a fifth consecutive victory over Andy Murray to set up a rematch of the 2015 Wimbledon final at the Western and Southern Open.
Federer defeated Murray 6-4 7-6 (8-6) in Cincinnati on Saturday to progress to the ATP 1000 Masters event's decider, where he will meet Wimbledon champion Novak Djokovic, who had come from behind to overcome Alexandr Dolgopolov 4-6 7-6 (7-5) 6-2 in the other semi-final.
The world number three claimed the first set on the back of an early break in the third game, with Federer jumping out to a 3-1 lead.
The 34-year-old Swiss took the set in 39 minutes and after the second set stayed on serve throughout, a tie-break was needed.
In a sign of things to come, Murray generally had to work hard to hold serve in the second set, while Federer won his last two service games to love.
A sloppy backhand from the world number two gave Federer a 3-1 lead in the tie-break, although Murray fought back to eventually lead 5-4.
After Federer's own riposte, Murray sent down a powerful serve that the Swiss could not control and the tie-break was level at 6-6.
But from there, Federer dictated with the veteran producing an audacious sliced backhand drop-shot off a Murray second serve to set up the 13th tie-break point in his favour, while the Swiss advanced on the back of a trademark volley at the net.
Murray has not beaten Federer since the 2013 Australian Open semi-finals.
Djokovic and Federer will meet for the 41st time in Sunday's final in Ohio, with both having 20 victories to their name in their head-to-head record.