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BUENOS AIRES, ARGENTINA - OCTOBER 07: Jia Wei Joel Koh of Singapore hits a return during the men's singles match against Rukesh Maharjan of Nepal on day 1 of the Buenos Aires Youth Olympics at Tecnópolis Park on October 07, 2018 in Buenos Aires, Argentina. (Photo by Marcelo Endelli/Getty Images)

BUENOS AIRES, ARGENTINA - OCTOBER 07: Jia Wei Joel Koh of Singapore hits a return during the men's singles match against Rukesh Maharjan of Nepal on day 1 of the Buenos Aires Youth Olympics at Tecnópolis Park on October 07, 2018 in Buenos Aires, Argentina. (Photo by Marcelo Endelli/Getty Images)