Roundup: Sinner, Swiatek progress to quarters at oppressive Australian Open
MELBOURNE, Jan. 20 (Xinhua) -- Defending men's champion Jannik Sinner and women's second seed Iga Swiatek had contrasting fourth round victories on Monday as several players wilted under searing conditions at the Australian Open.
Australia's title hope Alex de Minaur also progressed, but former Wimbledon champion Elena Rybakina crashed out.
In hot and sunny conditions on Rod Laver Arena, top seed Sinner o