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Uchiyama and Ito earned a berth for Japan in the second round as they struggled to beat Christopher Rungkat and Elbert Sie 6-4, 5-7, 2-6, 7-5, 6-2 in the doubles of the best-of-five contest.
"They started to return very well from the second set and it was difficult to keep our service games. Our returns were well, too, so we tried to concentrate on keeping our own games," said Uchiyama, 20.
"We tried not to be overwhelmed mentally and tried to play solid. In the end, we were able to win by regaining the momentum," he added.
On Friday, Ito and Go Soeda gave Japan a 2-0 lead in the opening-day singles without their ace Kei Nishikori, who was sidelined due to a left knee problem.
Japan's number three Ito whipped Indonesia's number one Rungkat 6-2, 6-2, 6-4 in the opener, while Soeda, fresh from winning the Maui Challenger in Hawaii two weeks ago, overwhelmed Wisnu Adi Nugroho 6-0, 6-0, 6-1.