Andy Murray's emotional condition and physical status was the talk of the ATP and WTA Washington Open after reaching Friday's quarter-finals left the three-time Grand Slam champion shattered and weeping. When play resumed, Zverev took a second break thanks to a series of errors by Nishikori and closed out the match.
Murray said, "I didn't realise until these last few months just how much I love this game".
With a week between Cincinnati and the US Open, the former world No 1 will hope to be involved on New York's hard courts as he looks to get past the quarter finals for the first time since winning in 2012 - though that will be dependent on how far he goes in Cincinnati and his recovery period in between.
"I'm giving my view right now as someone who's just come back from a very, very long injury layoff".
All tennis fans rejoiced at his pain-free movement and fitness levels shown to win three such draining matches.
German Zverev will meet Stefanos Tsitsipas in the semi-finals on Saturday after the up-and-coming Greek upset third seed David Goffin 6-3 6-4.
Only two other men's and women's quarterfinals were completed before all play was called off on a wet day that also included three-time major champion Andy Murray's withdrawal.
I don't think I should be put in a position like that.
But despite that three-hour battle, the 31-year-old was expected to face Australian De Minaur again today (1.20am United Kingdom time) for a place in the final four.
The 31-year-old, who only finished his third-round win against Marius Copil at 3am on Friday morning, said in a statement on the ATP website: "I won't be able to play my match tonight".
After Murray's announcement, O'Brien said she expected Murray would return next year.
"Not just my hip, but the rest of my body as well". I know that the weather's tricky for the scheduling. "Appreciate all the support this week in Washington, it's wonderful to be back playing".
"I do understand 3 a.m.is very hard for everyone", O'Brien said.
Murray - now ranked 832 in the world - lost the first set against Copil in one hour and six minutes, having taken a 5-0 lead in the tie-break before losing seven points in a row. After the Round of 16 match, Murray sat in his chair and cried into a towel, according to The Washington Post.
Zverev bounced back after dropping the opening set to overhaul seventh-seeded Nishikori 3-6 6-1 6-4, eliminating him from the tournament for the second consecutive year.
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