"They are all obviously playing extremely well", said Murray.
The duo also produced a thrilling five-set battle in the Davis Cup in March 2016 with Murray eventually prevailing in the fifth.
The world number one struggled with his opponent's explosive baseline hitting on Philippe Chatrier, but slowly warmed to his task in windy conditions as he secured a 2-6 6-1 7-6 (0) 6-1 victory.
Murray, who will now face 2015 champion Stan Wawrinka in a repeat of the semi-final match-up he won previous year, said: "I didn't feel like I played great tennis".
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Nishikori used the first set to show exactly why he has been a mainstay in the world's top ten, leaving Murray with very little chance in an opener which the Japan star claimed 6-2.
"The fourth, I think it was flawless tennis I played".
Murray, who was runner-up to Novak Djokovic at Roland Garros a year ago, will meet 2015 champion Stan Wawrinka for a spot in Sunday's final. "I think he's a very good umpire. So I'm sure it's going be tough one, but I will try to enjoy it and try to win the match".
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So I expect him to play his best tennis. In another quarterfinal, Pliskova meets No. 28 Caroline Garcia, a 6-2, 6-4 victor against Alize Cornet in a match between two Frenchwomen. Not easy. Long matches.
He won the first set 6-1, led by two sets to one and looked poised to go a break up in the fourth when play was interrupted by a loud noise from the PA system.
Nishikori surpassed Jiro Sato, who died in 1934, for the most quarterfinal appearances by a Japanese man, as he made the last eight for the second time in three years in Paris. "I think he was better than I was in the end", said Monfils.
Murray said: "Obviously for a couple of points after that I was sacked up, because I was frustrated at that moment".
The three-time major champion is on the prowl again, striking fear in the hearts of less aggressive, opportunistic players.
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