In-form Novak Djokovic set up a title showdown with Rafael Nadal at the ATP World Tour Finals in London with a convincing 6-3 6-3 victory over Stanislas Wawrinka.
The Serbian stretched his unbeaten run to 21 matches with an imperious display, one he admitted afterwards was his best of the week, against a man who had pushed him to five sets at both the Australian and US Opens in 2013.
Yet despite putting up a real fight in the first set, Wawrinka could do little to stop the world no 2 recording a fourth straight triumph over him in the year and a 14th in succession.
The Swiss, who had marked his debut at the season-ending event by reaching the last four, can at least console himself with the fact he will end a highly-productive campaign inside the top 10 in the rankings for the first time in his career.
He put up a brave fight for much of the first set, some big serves getting him out of trouble when on deuce on his service game before he then stunned his rival with a break.
Having seen one chance go begging, Wawrinka manipulated another opportunity with a whipped cross-court forehand winner and then sealed the deal with a volley at the net.
However Djokovic quickly drew level thanks to some wild forehands from the other side of the court, then claimed the crucial third break of the opener. He needed some stunning defensive work to give him the chance to serve for the set, despite the fact he had yet to hit a winner.
After saving a break point the six-time grand slam champion moved a point away from a 1-0 lead with a fine forehand on the run to his right. An ace duly sealed the set, and from then on it became one-way traffic.
An immediate break left Wawrinka staring down the barrel but he at least stopped the rot at five straight games to make it 2-1, though he had to save a break point to do so.
Instead Djokovic left it until the match was up for grabs to get his second break to see a Swiss beaten for the second time in the day; Roger Federer had been knocked out earlier by Nadal.
It means the finale will see the world's top two going toe-to-toe on Monday night, live on Sky Sports, with reigning champion Djokovic getting the chance to face up to the man who replaced him at the summit after the US Open.
"It was a very enjoyable match for me, it was my best performance at the tournament so far," said Djokovic.
"I don't think it's the right word to say I'm unbeatable. Nobody's unbeatable. Being in the moment and taking it one step at a time helps me keep my focus."
Watch the singles and doubles finals from the O2 on Sky Sports 3. Coverage begins at 6pm on Monday evening.