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Dusan Lajovic of Serbia serves during his match against Roberto Bautista Agut of Spain during the ATP Cup final between Spain and Serbia in Sydney, Australia, Jan. 12, 2020. (Xinhua/Zhu Hongye)

Dusan Lajovic of Serbia serves during his match against Roberto Bautista Agut of Spain during the ATP Cup final between Spain and Serbia in Sydney, Australia, Jan. 12, 2020. (Xinhua/Zhu Hongye)