Novak Djokovic beat Kei Nishikori, 6-1 3-6 6-0, in the semi-final on Saturday.
World number one, Novak Djokovic, ended Kei Nishikori's impressive debut at the ATP World Tour Finals, with a 6-1 3-6 6-0 semi-final victory, at the O2 Arena on Saturday.
The Serb was rattled by a mid-match onslaught from the Japanese, who came back from a poor start to dominate the second set, only for his challenge to fizzle out in the decider.
Things could have been different had Nishikori, the first Asian man to qualify for the year-ender, converted the two break points he had in the first game of the deciding set.
But Djokovic held firm and quickly regained control to march towards a 31st consecutive victory on indoor courts.
He set up match point with a searing crosscourt forehand winner, and U.S. Open runner-up Nishikori, double-faulted to end the contest after one hour 27 minutes.
"Kei was playing great and this has been the best season of his life but he made some crucial double faults in the third set," seven-times grand slam champion Djokovic said.
"Of course I will watch the semi-final (between Roger Federer and Stan Wawrinka). I'll get some popcorn and enjoy it from my bed."
Djokovic had gone through the group stage with wins against Marin Cilic, Stanislas Wawrinka and Tomas Berdych, for the loss of a mere nine games, a tournament record.
When the pressure of the occasion appeared to get to Nishikori, in a first set that last 23 minutes, the Djokovic juggernaut looked unstoppable.
Nishikori ballooned another forehand long, to drop serve, at the start of the second set, and the crowd, who paid big money for their tickets, looked like being short-changed.
Things turned in the next game, however, when Nishikori suddenly had a break point chance, and Djokovic double-faulted, prompting huge cheers from the stands, which clearly annoyed Djokovic who sarcastically applauded.
World number five Nishikori began to dictate the rallies and drag Djokovic out of his comfort zone.
Leading 4-3, he set up a break point with a forehand winner, and converted it after teasing Djokovic with a drop shot, and then a topspin lob, which the Serb could only fend back mid court, following which Nishikori ripped away another forehand winner.
Two aces helped Nishikori level the match, and a grandstand decider looked in store, after so many disappointing one-sided matches at the tournament.
However the Serb dug himself out of trouble, to move 1-0 ahead in the third set, and swung the momentum back his way.
The 27-year-old, who has already clinched the year-end world number one ranking, can become the first man since Ivan Lendl (1985-87), to claim three consecutive Tour Finals crowns, if he wins on Sunday against either Roger Federer or Wawrinka, who face each other later in an all-Swiss semi-final.
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