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(160121) -- MELBOURNE, Jan. 21, 2016 (Xinhua) -- Stan Wawrinka of Switzerland returns the ball during his men's singles second round match against Radek Stepanek of Czech Republic at the Australian Open Tennis Championships in Melbourne, Australia, Jan. 21, 2016. Wawrinka won 3-0. 21.01.2016 MELBOURNE Tenis Ziemny Australian Open Xinhua News Agency /SIPA/ PRESSFOCUS POLAND ONLY!!