Novak Djokovic defeated Andy Murray to set up a US Open semi-final clash against Kei Nishikori who became Japan's first semi-finalist in almost a century on Wednesday.
World number one Djokovic, the 2011 champion, reached his eighth consecutive US Open semi-final by downing Murray 7-6 (7/1), 6-7 (1/7), 6-2, 6-4 for his 13th win in 21 meetings against his childhood rival who had taken the 2012 title.
Nishikori, the 10th seed, had earlier needed more than four hours to defeat third seed Stan Wawrinka 3-6, 7-5, 7-6 (9/7), 6-7 (5/7), 6-4 to become the first Japanese man in the semi-finals in 96 years.
Wimbledon champion Djokovic and Murray had spent a record-equalling 4 hours 54 minutes contesting the 2012 final and their quarter-final clash threatened to surpass that mark when they needed over two hours to get through the first two sets of a tie that started on Wednesday and finished Thursday.
By the end, however, Murray was struggling with what appeared to be a recurrence of his long-standing back problem, a legacy of having spent three and a half hours more on court than Djokovic in getting to this stage.
But victory was also a testament to the top seed's intimidating defensive skills as he saved 12 of 16 break points in the 3-hour 32-minute encounter which saw Murray commit 65 unforced errors to Djokovic's 48.
"We both gave our best and at times the tennis was not nice but that was due to the intense physical battle in the first two sets," said Djokovic.
"I didn't expect anything less from Andy. Our last few matches have been three and four hours and he has a lot of quality on all sorts of surfaces. I knew it would be a tough match and that the more aggressive player would win."
Djokovic and Nishikori are 1-1 in career meetings but their last clash was three years ago.
"It's great for Kei and Japan for him to be in the semi-final. He serves and moves very well," said the world number one who has made the final in New York in the last four years.
In a breathtaking first set of big-hitting, fine angles and lung-busting sprints, the two opening games were breaks, taking 13 minutes to complete.
Djokovic raced into a 4-1 lead but Murray pulled it back to 4-4 while the ninth game featured a 29-shot rally and the 10th a 104mph forehand off the Murray racquet.
