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Grigor Dimitrov/Alexander Zverev(R) compete during the FAST4 of Sydney International match between Nick Kyrgios/Lleyton Hewitt of Australia and Grigor Dimitrov of Bulgaria/Alexander Zverev of Germany in Sydney, Australia, on Jan. 8, 2018. Nick Kyrgios/Lleyton Hewitt won 2-1.(Xinhua/Bai Xuefei)