Djokovic will face a much more challenging test in the last eight.
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The Serb, who learned Wednesday that he would be back as world No. 1 next week following Rafa Nadal's withdrawal from the tournament through injury, was leading 6-1, 2-1 when the Bosnian submitted to a back problem that had flared up in the first set.Cilic, who moved closer to securing one of the remaining places for the ATP finals in London, beat Djokovic here at the equivalent stage two years ago and also defeated him in the Queen's tournament final before Wimbledon.The giant American saved four match points before the 22-year-old Khachanov, who had already staved off two himself, finally threaded a backhand winner past the net-rushing Isner to win after nearly 2 1/2 hours of massive hitting.
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