Japan‘s Naomi Osaka serves to Karolina Pliskova of the Czech Republic during their semifinal at the Australian Open tennis championships in Melbourne, Australia, Thursday, Jan. 24, 2019. (AP Photo/Andy Brownbill) <저작권자(c) 연합뉴스, 무단 전재-재배포 금지>

epa07313947 Petra Kvitova of the Czech Republic in action against Danielle Collins of the United States during their women‘s singles semi-final match on 11 of the Australian Open Grand Slam tennis tournament in Melbourne, Australia, 24 January 2019. EPA/LUKAS COCH AUSTRALIA AND NEW ZEALAND OUT <저작권자(c) 연합뉴스, 무단 전재-재배포 금지>