Murray watches as Federer contests a call during the match
Andy Murray remains on course for his third successive Shanghai Masters title thanks to a 6-4 6-4 victory over Roger Federer in a one-sided semi-final.
The Briton, 25, took the first set after three straight double faults from Federer gifted him a pivotal break, reports the BBC.
Two rain delays in the second, one before Murray served for the match, threatened to upset the Scot's rhythm but he kept his composure to win.
Murray now faces world number two Novak Djokovic in Sunday's final.
Both players produced some scintillating tennis in a semi-final that was halted for almost half an hour by light rain in China, with US Open champion Murray preparing to serve for the right to face Djokovic in a repeat of the New York final.
But the delay did not affect Murray's concentration as he powered to victory.
"He didn't serve that well for him so I was able to be very aggressive on his second serve," said Murray.
"He maybe slowed down his first serve a little bit so I was able to take a few more chances on the first serve. Obviously that helped, but I went for it like I did the last few times I played against him."
On Federer's three straight double faults, Murray added: "I haven't seen him do that in his whole career. I was being aggressive on the second serve, but still that is not something he would normally do.
"The balls here are very light so it can be tough sometimes to control the serve. But it was surprising."
The Scot led Federer 9-8 in head-to-head meetings going into the match following his gold medal-winning victory in the Olympic final.
Murray oozed confidence throughout, attacking Federer from the start in a stylish, aggressive display that left the Swiss looking well below his best.
It was an uncharacteristically edgy display from the 17-time Grand Slam winner, who struggled to cope with Murray's excellent returning - and it was a sign of the Scot's determined mood that he broke in the first game.
Murray surrendered that early advantage in the next, before the world number one saw his serve broken for a second time in the fifth game.
It came in remarkable fashion as Federer produced a scarcely believable run of three double faults to gift Murray the break.
The Wimbledon champion was again on the back foot in the opening game of the second set, saving six break points before the game's contentious first rain delay.