Kei Nishikori strengthened his bid to become the first Asian to qualify for an ATP year-end final as the fourth seed defeated American Donald Young 6-4 7-6 (7-4) on Thursday at the Japan Open.
The US Open finalist will be playing a home quarter-final for the third straight year after winning the tournament in 2012.
Nishikori stands sixth in the points race for next month's eight-man World Tour Finals in London. Five places remain open in the elite field.
Nishikori has been setting records all season and came to Tokyo after winning the Kuala Lumpur event last weekend.
The 24-year-old, who is based in Florida, has already become the first Japanese player to win a clay title (Barcelona in April), as well as being the first from his nation to crack the ATP top 10 and the first Japanese to play a grand slam singles final.
He needed only one break to get the better of Young, a one-time prodigy who has never lived up to expectations.
The Japanese took his victory in less than 90 minutes, despite a brief hiatus in the first set for the roof of the Ariake Colosseum to be closed when it started to rain.
Nishikori resumed with his only break of Young for a 3-2 lead which held up throughout the set. The second set was decided with a tiebreaker after Nishikori saved a set point in the 12th game.
The Japanese tennis hero fired a cross-court winner to earn two match points and converted on his first from a forehand winner.
Canadian third seed Milos Raonic, losing finalist at the past two editions, set up a quarter-final with Uzbek Denis Istomin.
Raonic, also in the fight for a London year-end place, beat Austrian veteran Jurgen Melzer 6-4 6-3 while Istomin defeated Poland's Michel Przysiezny 6-4 7-6 (7-5).
The Raonic ace count in victory was only half of the 22 he managed in his opening win on Tuesday, but the Canadian was not concerned.
"I'm playing good tennis right now, I lifted my level from the first round. But I'm not thinking too far ahead (to a third straight final)."
Raonic stands 2-0 over Istomin, with a pair of wins in San Jose.
"He can do a lot of thing impressively," said the Canadian of his opponent. "I have to keep getting better and better and create opportunities. I have to really contain him as much as I can."
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