Competing in the singles event of the Surbiton Challenger in Great Britain, Yuki went down fighting 6-7(6) 6-2 5-7 to fifth seed German Dustin Brown, ranked 76 in the world, in the second round.
Brown is Jeevan Nedunchezhiyan's partner in the doubles event and they are up against top seeded pair of Aisam-ul-haq Qureshi and Marcus Daniell in the quarterfinals.
They had overcome Britain's Ken and Neal Skupski 7-6(5) 6-7(3) 11-9 in a gruelling opening round match of the Euro 127000 grass court event.
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