"I played a bad game in the third set to get broken".
When Khachanov gave up another break with a double fault in the third game of the second set, it looked like it would be utterly plain sailing through to the last eight. You always have to expect guys to fight hard.
The Briton, who lost to Novak Djokovic in past year s final at Roland Garros, will meet Japanese eighth seed Kei Nishikori for a place in the last four.
"I just try to find myself into this zone where I don't do much unforced errors", the Ukrainian said, "and still play aggressive".
Cilic was leading 6-3, 3-0 after just 48 minutes when Anderson called it quits.
Cilic, the 2014 U.S. Open champion, will next face either third-seeded Stan Wawrinka or No. 15 Gael Monfils.
Marin Cilic completed the quarter-final line-up when South Africa's Kevin Anderson retired with a thigh injury trailing 6-3, 3-0.
Murray has had to grow accustomed to comparatively early starts here and he did not have to wait long to go out on on court following Simona Halep's quickfire victory over Carla Suarez Navarro in the day's opening match.
Murray was already picking up the huge deliveries of Khachanov, and he worked a break-point chance with one such cracking return of serve, and broke for 4-2 as the Russian put a forehand wide.
(AP Photo/Christophe Ena). Ukraine's Elina Svitolina clenches her fist as she defeats Croatia's Petra Martic during their fourth round match of the French Open tennis tournament at the Roland Garros stadium, Monday, June 5, 2017 in Paris.
Murray headlining field at French Open Day 3
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President Trump: Kushner is doing a 'great job' for the country
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Red Sox Place Starter Eduardo Rodriguez on Disabled List
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Donaldson looks forward to being in NDP minority government
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Japan urges China to do more to pressure North Korea
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Trump Pleased With Results of First Overseas Trip
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AMD RX Vega GPUs to launch in July
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